Measure Twice, Cut Once: What to Know Before You Grow

There are a few things worth knowing before you get started. As my dad would say, measure twice, cut once — proper preparation before taking action is what saves your sanity and your wallet.

Nearly every garden failure I've seen, including a fair number of my own, traces back to something that should have been thought through before a single seed went into the ground. Not bad luck. Just a step that got skipped. Preparation matters that much.

Here's the short list:

• Hardiness zone
• First and last frost date
• Soil conditions
• Soil temperature
• Your goals

Five items. Boring on paper. Expensive to learn the hard way.

Hardiness Zone

If you live in the USA the first thing you should find out is your growing zone. In the USA we have hardiness zones — specific geographic regions with distinct climatic conditions affecting a plant's growth and survival. North America has been divided into thirteen zones, and each zone reflects the average minimum winter temperatures for a region, helping you determine whether a plant can survive the winter in your area. You can find yours using the USDA Plant Hardiness Zone Map.

Zones are further divided into "A" and "B" designations, reflecting slight temperature differences within each zone. "A" is the cooler half, "B" is the warmer half. These distinctions help with precise planting recommendations, since local climates can vary. Zone 6A has harsher winters than Zone 6B.

For a tangible example, let's say you want to grow your own chocolate tree. Yes, chocolate does actually grow on trees. If you're in a warm zone, 11A–13B, you might be able to grow one successfully. Outside those zones you are doomed to fail unless you create the right environment, like a heated greenhouse. It's no fun spending money on something you're excited about just to have it die on you. Thankfully the zone system makes it quite a bit easier to find plants that are more likely to thrive in our spaces.

If you're outside the USA you'll most likely have a different system, but you can still compare your region to US zones and utilize plants that most closely align with your growing conditions. For example, based on a comparison of climatic conditions, Paris, France would have similar growing conditions to zone 7 here in the USA. So plants recommended for zone 7 might be a good starting point for Paris.

One important note: zones get revised, and most people are working from an outdated number. The current USDA map was released in 2023 and is based on weather data from 1991 to 2020. Compared to the 2012 version, roughly half the country shifted into the next warmer half zone. Some of that is genuinely a warming climate and some is simply better data — the 2023 map used many more weather stations and more sophisticated mapping. Either way, if you looked up your zone more than a few years ago, look it up again. Even within the same state, individual locations moved.

Click here to find your hardiness zone

That said, if we step into the weeds for a minute — this is just a starting point. Regardless of your zone, your unique conditions could be different, and over time you'll get more familiar with what works in your space. Seriously, a microclimate can be as small as a few square inches, like the area underneath a rock, or the corner by your front door, and that will impact what thrives there. So it's good to know what your zone is, but it's just one point of reference, not an irrefutable law for gardening.

Frost Dates

Once you know your zone, you should find your first and last frost date. Honestly, in my opinion this is almost more important to know. These dates indicate when your area is likely to experience its first and last freezing conditions of the year. This is important because your last frost date will help you plan when you can get tender plants in the ground, and your first frost date will help you decide when you'll need to harvest your tender plants.

For example, in 2025 I planted my tomatoes very late in the season. By paying attention to the weather and knowing my last frost date, I was able to keep them going until mid-November and get a decent harvest of tomatoes. I also knew when to pull the green tomatoes so they wouldn't split during our first frost. Again in 2026, we had warm weather at the beginning of spring for two weeks then got hit with a hard frost. I lost all my pepper plants because I was too impatient and thought covering them for the frost would be enough. It wasn’t and I was just lucky I had back-up plants on deck to replace the ones I lost.

One thing to understand about frost dates: they're probabilities, not appointments. A "last frost date" is normally expressed as a date with a percentage attached, meaning there's a certain chance of frost after that date in a typical year — which is why some years you sail past it and some years you get burned. If you have tender plants you can't afford to lose, plant after the later, more conservative date, or keep frost protection on hand for a few extra weeks. The dates also aren't specific to your property. Cold air settles into low spots and valleys, so a garden at the bottom of a slope can frost while one twenty feet uphill doesn't. That's the same microclimate concept at work.

Soil Conditions

Next is knowing your soil conditions. Understanding your specific soil conditions is essential for growing anything, but it is particularly important for growing healthy food, as soil provides the nutrients, water, and support a plant needs in order to thrive. Nothing is more depressing than planting and caring for something that dies despite all your love and attention, just because the soil wasn't quite right.

This is most relevant if you are planting directly in the ground. If you are planning to use bagged soil in raised beds, look at the packaging and it will likely have a few key bits of info like pH and nutrient percentages.

Here are key factors to consider when evaluating soil conditions for growing food.

Soil Type

Soil comes in various types, each with different properties. The four main types are:

Silt. Smaller particles that retain moisture but have better drainage than clay. It's smooth and easy to work with.

Sand. Coarse particles that drain quickly but don't retain moisture well. Sandy soil often needs organic matter to improve its fertility. However, this free draining soil is perfect for certain types of plants.

Loam. A balanced mix of sand, silt, and clay. Loamy soil is ideal for most vegetables because it has good drainage, retains moisture, and is rich in nutrients.

Clay. Fine particles that retain water but drain poorly. It can become compacted and hard to work with. Clay also dries out quickly in sun or heat and then splits, which further ruins the soil structure and health. Adding organic matter is often the best and fastest way to improve this kind of soil.

This happens to be the kind of soil I have. In some areas it's so badly compacted that I've resorted to raised beds. In other places I've used heavy machinery to remove it and replace it with a topsoil/leaf compost blend, and in other areas I'm improving it with regular top dressings of compost and bio-diverse deep-rooting plant species.

If you have clay soil, don't despair. Clay particles carry negative electrical charges that allow them to hold onto essential nutrients through cation exchange. Clay is valuable for nutrient retention, but it needs to be balanced with organic material to improve airflow and water movement.

One more note: if you have clay soil and you want to add something to help make it lighter and more water permeable, please do not add sand. Clay plus sand equals cement. Stick with things like compost to be safe.

Test Your Soil

I have to be careful when I talk about this because it's too easy to sound like a nagging broken record, so bare with me.

Testing your soil is extremely useful and important for a variety of reasons. A soil test gives you a comprehensive analysis of your soil's nutrient levels, pH, and other useful data points. The results will help you understand any soil deficiencies or imbalances and guide you in adjusting your soil for optimal growing conditions. Knowing this info can often save you quite a lot of money on unnecessary fertilizers and treatments too.

For example, let's say you've hired a lawn care company and part of their service includes fertilizing your lawn, and they are applying 200 pounds of fertilizer per 1,000 square feet but your soil test shows that you only need 100. This means you're paying for double the amount you actually need, and based on fertilizer costs in my area, that's at least $200 down the drain every time — what a pointless waste of money.

Another overlooked part of this story is that the 100 pounds of excess fertilizer that isn't being used by your lawn, that you wasted your hard earned money on, all that fertilizer ends up in our waterways and it is devastating our environment. If you ever hear about an algae bloom in a local pond, lake, river, etc., it might be because of this exact situation. Excess fertilizer making its way into our water degrades water quality, harms fisheries, increases drinking water treatment costs, reduces biodiversity, and undermines decades of restoration work.

It's a much more widespread and severe problem than you might realize, so please test your soil. The cost of the test will more than pay for itself the next time you need to fertilize. You can save some money while patting yourself on the back for taking care of the environment. It's an easy win. OK, nagging over.

I'd recommend getting a soil test kit from your local garden center or buying one online. Check in with your local Master Gardeners too. In my county we have a program for helping home and property owners get the best lawn possible. When someone signs up, a Master Gardener comes out and performs a soil test among other assessments. The test is shipped off to Virginia Tech for testing, and the results, combined with the other assessments, all that data is curated into an actionable plan for the client to follow. Chances are you might have a program like that in your area, or some resources available to you, so try to find your local Master Gardeners.

One thing you should know before you read your results: your soil test will not tell you about nitrogen, and that surprises almost everyone. Nitrogen is the nutrient plants use in the greatest quantity, and it's the one that goes missing most often — so why isn't it measured? Because nitrogen is the most mobile nutrient in the soil. Plants take it up as nitrate and ammonium, and nitrate isn't held by soil particles at all; it dissolves in water and leaches away with rain or irrigation. A number from a sample taken weeks ago tells you almost nothing about how much will be there when your plants need it. So labs test everything else and estimate your nitrogen need from your organic matter level and the crop you're growing instead. It's a real limitation, and knowing it saves you from assuming your "complete" test covered everything.

What a Soil Test Looks Like

Here is what the results from one of my tests looked like:

What this test shows is an analysis of the plant-available levels of P (phosphorus), K (potassium), Ca (calcium), Mg (magnesium), Zn (zinc), Mn (manganese), Cu (copper), Fe (iron), and B (boron). The rating just shows if I have enough of it in my soil for a specific crop to grow. In this case we're looking at where I am attempting to grow a lawn so the crop would be grass. L is low, L+ is almost medium, M- is almost low, SUFF is sufficient. There are also ratings for H (high), VH (very high), DEF (deficient), and EH (excessively high). EH only applies to salts which I opted to not test for this time around.

Here is an extremely basic summary of how these nutrients are important to plants. Macronutrients: P supports root development, K regulates water movement and stomatal function — just think of it as how the plant breathes — Ca builds cell walls, Mg is essential for photosynthesis. Micronutrients: Zn supports hormone production, Mn is important for photosynthesis, Cu supports structural strength, Fe is essential for chlorophyll formation, B is needed for cell wall formation.

Now, back to that missing nitrogen. Since it isn't on the report, your nitrogen comes from two places: what's already cycling out of your soil's organic matter, and what you add. Organic matter releases nitrogen slowly as soil life breaks it down, which is one more reason building organic matter is the answer to so many problems. Organic matter percentage is usually reported on your test, and it's worth looking at — for most garden soils, an organic matter level of roughly 3% to 6% is a reasonable target, with anything under 3% being a sign you should be adding compost. Sandy soils run lower, and heavy clay or muck soils can run higher.

The catch is that the organic matter number tells you about your soil's general condition, not exactly how much nitrogen will show up this season. Release depends on temperature, moisture, and what the organic matter is made of, so treat it as a direction rather than a quantity. If your plants look nitrogen-hungry, you'll be diagnosing that by eye rather than by lab report — more on that below.

The next part of the lab results:

What this shows is that my soil pH is extremely acidic. If pH is a new concept, here's the short version: the scale runs from 0 to 14, with 7 being neutral, lower numbers acidic and higher numbers alkaline. Most soils fall somewhere between 4 and 8.5.

pH isn't just a number — it controls how nutrients behave in the soil. When soil becomes this acidic, aluminum and manganese can become toxic, nutrients like P, Ca, Mg, and K become unavailable which would be devastating for plants, and microbial activity slows dramatically which also hurts the plants. The reverse is true at the other end: above roughly 7.5, micronutrients like iron, copper, manganese, zinc, and boron start to lock up and plants can't reach them, even when there's plenty in the ground. This is why adding fertilizer to a pH problem doesn't fix it. The nutrients are there; the plant just can't get at them.

The buffer index measures how resistant your soil is to pH change. Labs use this number to calculate how much lime is required. This is one of the nutrients that are often over applied, but in my case I haven't been using enough.

Estimated CEC is cation exchange capacity. We touched on it under clay, and here's what it means in practice: CEC is a measure of the soil's ability to hold onto nutrient cations like calcium, magnesium, and potassium instead of letting them wash away. It comes from clay and organic matter, so it varies enormously by soil type. Very sandy soils sit around 1 to 5, loams around 5 to 15, clay loams 15 to 30, clays above 30, and organic or muck soils can run 50 to 100. Mine came in at 6.0, which is on the low side — that means my soil holds nutrients poorly and I need to add them more often and in smaller amounts rather than in one big dose. If your CEC is high, the opposite applies: your soil holds onto what you give it, so amendments last longer but it's also easier to over-apply and create imbalances. Whatever your number, it's the same lesson as the lime recommendation — the right amount to apply depends on your soil's capacity to hold it.

Acidity influences the amount of recommended lime to use. Higher acidity means more lime is needed. In my case 81.8 is extremely high acidity. To deal with it, my test included a recommendation of applying 270 lbs of agricultural limestone per 1,000 square feet, across several small applications over a 6 month period. Small amounts over a long period of time give the plants and ground a chance to effectively absorb it. If I tried to do 270 lbs all at once the vast majority would just wash away.

Base saturation is the percent of CEC occupied by basic cations which includes the Ca, Mg, K, and Na. This number helps assess the soil fertility and nutrient balance. Mine is very low and this is in large part because of how acidic my soil is. My Ca saturation is very low which explains poor soil structure, low pH, and nutrient imbalance. The Mg saturation contributes to the acidity and poor nutrient retention. Lastly, the K saturation tells you whether the soil has enough potassium available to plants.

You might not need all of these different data points but I enthusiastically recommend you get the test done anyway. The recommendation I hear the most often is to test your soil once every three years, but doing it at least once is better than not doing it at all.

Adjusting Your Soil

If you need to make adjustments to your soil acidity there are a variety of ways to do that. They all include adding something but please keep in mind that the soil is a living ecosystem. Adding or removing anything could have unintended consequences. Personally I think the safest method of improving soil conditions without damaging the ecosystem is to add fully composted organic matter. This includes things like compost and composted manure. No matter what you choose to do just make sure to read the instructions on the package.

Before we get into the amendments, let's answer the question you'll actually need answered: what are you aiming for? For most vegetables, you're shooting for somewhere around 6.0 to 7.0, with many extension services putting the sweet spot a touch narrower, around 6.0 to 6.8. Lawns are happy around 5.5 to 6.0, and roses prefer 6.5 to 7.0. Then there are the plants that want it genuinely acidic — blueberries, azaleas, and rhododendrons want roughly 4.5 to 5.5. Blue hydrangeas need below 5.0 to actually turn blue. Note that this is me telling you the general targets, not your target. For anything you're taking seriously, your soil test recommendation is the number to follow, because it accounts for your soil type and buffering. If you don't have a test, the product label is the fallback.

Making Soil More Acidic (Lower pH)

If your soil is too alkaline (pH higher than 7) and you want to make it more acidic (lower pH), here are some common amendments:

Elemental Sulfur. Adding elemental sulfur is one of the most effective ways to lower soil pH. Soil bacteria will convert the sulfur into sulfuric acid, which will acidify the soil. But be patient and do not overdo it. This is a biological process that depends on temperature, moisture, and oxygen, and it can take several months to over a year before you see a change. Test your pH again three to four months after applying, and reapply only if you're still out of range. On dosage, a useful rule of thumb from extension guidance is that most soils need somewhere in the range of 35 to 56 pounds of sulfur per 1,000 square feet to move pH by half a point — but do not apply more than 20 pounds per 1,000 square feet in any single application, and split larger amounts across seasons. Clay soils and heavily buffered soils need more than sandy ones. This is one where a soil test recommendation is worth far more than a general rule.

Aluminum Sulfate. This can also lower pH, but it works more quickly than elemental sulfur. It's typically used for plants that require more immediate results, such as hydrangeas since soil acidity can change the color of their flowers. One caveat: it adds aluminum to your soil, which is already the thing that turns toxic in very acidic conditions, so use it sparingly and don't make it your default.

Iron Sulfate. This is another quick-acting option to lower pH and works similarly to aluminum sulfate but is safer for some plants like blueberries.

Organic Matter. Organic materials like pine needles, sawdust, or coffee grounds can help acidify soil slightly over time as they break down. I'll be honest about this one: the effect is modest. If you have a real pH problem, this is a complement to proper amendments rather than a fix on its own.

Making Soil Less Acidic (Higher pH)

If your soil is too acidic (pH lower than 7) and you want to make it less acidic (raise pH), here are some common amendments:

Lime (Calcium Carbonate). This is the most common and effective way to raise soil pH. Agricultural lime or dolomitic lime is typically added to the soil. Lime works slowly, so it's best applied well ahead of planting — the ideal window is two to three months before you plant, and fall is the natural time to do it. Apply it evenly and work it into the top four or five inches of soil. Incomplete mixing is a real problem; it can make a later test show you need more lime, you add more, and now you've over-limed and your plants are suffering. On maintenance rates, a common extension guideline is about 75 pounds of dolomitic limestone per 1,000 square feet every three years to hold pH steady — that's for maintaining, not for correcting a severe problem like mine. Correcting an actual deficiency takes a test recommendation.

Dolomitic Lime. This is a type of lime that also adds magnesium to the soil, which can be helpful for plants that require it, such as tomatoes or peppers. Worth noting: if your soil test already shows your magnesium is fine or high, use plain calcitic lime instead, or you'll be pushing your magnesium numbers up while trying to fix your pH.

Wood Ash. Wood ash can also raise soil pH and add valuable potassium to the soil. It's best used in small amounts, as it is highly alkaline, and it acts faster than lime so spring application before planting is workable. One extension guideline puts the maintenance rate at roughly 150 pounds per 1,000 square feet every three years. If you're using ash from your own wood stove, don't add it to the garden every year unless a test says you need it — it's very easy to apply too much, and it will push your pH past where you want it. And keep it away from acid-loving plants like blueberries, rhododendrons, and scab-susceptible potato varieties, which don't want the pH bump.

Bone Meal. Bone meal is an organic option that can slightly raise soil pH while providing essential nutrients like phosphorus and calcium. It's typically used for plants that benefit from a slightly more alkaline soil. It's great for growing tomatoes too.

Soil Structure

Soil structure refers to how soil particles (sand, silt, clay) clump together to form aggregates. A good soil structure allows roots to penetrate and air to circulate, which is crucial for plant health. Yes that's right — roots need air too! This is why I stress using organic matter or even switching to a no-till or low till gardening method rather than disturbing the soil as much as most home and commercial gardeners do. But that's a story for another day. The main point: if your soil is compacted, it's important to take action to fix it, and you can do that by following the steps laid out above. Start by amending the soil with organic matter.

Soil Drainage

Proper drainage is crucial to prevent root rot. To test drainage, dig a small hole, about 12 inches deep, and fill it with water. If the water drains within 1-2 hours, your soil has good drainage. If it takes longer, you may need to improve drainage by adding organic matter or even building raised beds.

A necessary caveat on that test: what counts as "good" depends on your soil type. Sandy soil can drain in minutes and that's completely normal for sand — fast drainage isn't a failure, it just means you'll be watering and feeding more often. Clay soil that drains in two hours is genuinely excellent news. So read the result against your soil type rather than against the clock alone. What you're really watching for is standing water that stays put for hours or overnight, which is the actual warning sign.

For my clay environment, in addition to organic matter, I've added things like coconut coir for better drainage. I've also tried volcanic pumice, perlite, PermaTill, and other similar things, since they make aerating clay soil much easier and long lasting. So far that seems to be working just fine.

Soil Fertility

Soil fertility refers to the soil's ability to supply essential nutrients to plants. The main nutrients plants need are nitrogen (N), phosphorus (P), and potassium (K), often referred to as NPK. These are the numbers you'll find on any soil additives and fertilizers. However, these are not the only things plants need. They're just a starting point. Fertile soil is rich in organic matter, which helps retain moisture and nutrients.

Let me say a proper word about nitrogen, since it's the one that isn't on your test and the one plants need most. Nitrogen is what drives leafy green growth. It's also the nutrient that moves through your soil fastest — it leaches with rain and irrigation, and it's released on its own schedule as soil life breaks down organic matter. Practically, that means most garden soils are more likely to be short on nitrogen than anything else, that you apply it in smaller amounts more often rather than in one big dose, and that the most durable way to supply it is by feeding your soil rather than your plants. Compost, composted manure, and legume cover crops all put nitrogen into the system in a form that's released gradually. Fast-acting nitrogen fertilizers give you a quick response but they don't build anything that lasts, and overshooting is easy.

• Composting. Adding compost or well-rotted manure can enhance soil fertility by providing organic material and nutrients.

• Organic Nutritional Supplements. I recommend sticking with organic sources of nutrients. Chemicals are more likely to negatively impact the soil biology which can lead to hard to solve problems down the road.

• Soil Testing. A soil test can determine nutrient levels and help you decide if you need to add fertilizers or amend the soil with specific nutrients.

A Word About Your Compost

Since compost is my recommendation for nearly everything, it's worth knowing where it can go wrong, because there are two real risks and both are avoidable.

The first risk is herbicide residue. A class of broadleaf herbicides — aminopyralid, clopyralid, picloram, and related compounds — is used on pastures, hayfields, and some lawns, and these chemicals pass through an animal's digestive system essentially unchanged. If a horse or cow ate treated hay, the residue comes out in the manure. It also survives composting, and it can remain active in manure, hay, and compost for an unusually long time. The damage shows up when you spread it: tomatoes, potatoes, beans, and other broadleaf plants come up twisted, curled, and stunted, and it can persist in your soil for a year or more.

This is easy to avoid once you know to ask. Before you buy manure or compost, ask the seller what herbicides were used on the animals' feed or on the grass clippings that went into it. Ask whether they run a bioassay — growing sensitive plants in a sample to check for residue. If you're buying bulk compost, that's a fair question and a good supplier will have an answer. If you suspect contaminated material has already gone into your garden, don't panic and don't pile on more amendments. The residue does break down over time; research on aminopyralid in soil puts its half-life at roughly 34 days, so the standard advice is to wait it out, keep the affected area planted with something tolerant or nothing at all, and let soil biology do the work.

The second risk is immature compost. Compost that hasn't finished breaking down is still actively decomposing, and if you work it into your soil it will compete with your plants for nitrogen and can harm roots. Good finished compost smells earthy rather than sour, is dark and crumbly, and — most tellingly — the original materials should no longer be identifiable. If you can still recognize what it used to be, it isn't done. When in doubt, let it sit another few weeks. Municipal compost is generally a fine product, but it's made from unknown inputs, so if you're planting sensitive crops it's worth asking whether they test for herbicide residue.

Soil Temperature

This isn't something you'll have to worry about before you plant, like the other items on this list, but it's still important to know and will affect your garden year round. Soil temperature plays a vital role in germination, growth, and overall plant health. Different plants have different soil temperature preferences — tomatoes and peppers like warm soil, lettuce and spinach like cool soil. If you plant pepper seeds in cold soil, they simply will not germinate until the soil warms up. If the soil stays too cold, they may not germinate at all.

Soil temperature can vary depending on depth, time of day, and season. I don't stress over soil temperatures too much, but I do have delicate plants that can't go into the ground until the soil stays above 50°F/10°C, so I wait to plant those until the nighttime temperature stays at or above 50°F for at least a full week. There are tools to help you know your soil temperature more precisely, like a soil thermometer. Or you can take the low-effort approach — plant in small batches at different times throughout the season and see what survives.

When Something Goes Wrong: A Diagnostic Cheat Sheet

You've done the preparation. Something still doesn't look right. This is where most people start guessing, and guessing usually means buying fertilizer you don't need. Here's the basic logic.

The single most useful clue is which leaves are affected. Nutrient mobility inside the plant tells you where to look. Mobile nutrients — nitrogen, phosphorus, potassium, magnesium — get moved out of old growth to feed new growth when supplies run short, so the symptoms show up on the older, lower leaves first. Immobile nutrients — calcium, iron, and the other micronutrients — can't be moved, so a shortage shows up on the newest growth first.

A few things I want to be clear about, because this is where people waste money:

Blossom end rot (common with things like tomatoes) is not a calcium problem you can fix by adding calcium. This is one of the most common mistakes I see. The calcium has to move to the fruit through the plant's water flow, and calcium doesn't get redistributed from leaves to fruit. When a rapidly growing plant hits hot, dry conditions, or its watering swings wildly, water and calcium don't reach the developing fruit in time. Adding calcium to the soil usually does nothing. Water deeply and evenly, mulch, and keep the moisture consistent. The plants generally grow out of it.

Nutrient lockout is more common than nutrient shortage. If your pH is out of range, the nutrients may be sitting right there in your soil and simply unavailable. Before you buy a single bag of fertilizer, compare what you're seeing against your pH. Above 7.5, micronutrients lock up. Very acidic soil makes phosphorus, calcium, magnesium, and potassium unavailable and can make aluminum and manganese toxic. Fixing the pH fixes the symptom.

Yellow leaves are a description, not a diagnosis. Yellowing can come from nitrogen, potassium, sulfur, iron, magnesium, zinc, herbicide damage, poor drainage, or a root problem. The pattern and the location on the plant are what narrow it down. Two plants can both be yellow for entirely different reasons.

If you get a confusing result, take photos of the affected leaves, note whether they're old or new growth, and bring them to your local extension office or Master Gardeners. That's free expertise and it'll save you a season of guessing.

Two Quick Stories About Why This Matters

Both of these have changed how I think about what I put in my garden.

The Citrus Orchards of Italy

Many old citrus orchards in Italy have relied on inorganic supplementation for decades, in the same way that commercial farms all over the world have. Over time this depleted the macro- and microbiology in the soil, leaving hard, compacted, depleted clay. Yields started to fall off, and trees began dying. Through much trial and error, they found the solution: drilling a series of holes around the trees and filling them with rich organic compost. Those compost plugs helped repair the soil texture and fertility, saved the historic trees, and got the yields back on track. If they hadn't learned these soil restoration techniques, those orchards would be gone. Along with mulching, this is a technique I plan to use on my own property to stop the clay from choking out my plants.

Broccoli Isn't What It Used to Be

Soil health affects the nutrient density of the food we eat. Over decades of industrial farming, the nutrient content of many vegetables has declined, and the most frequently cited culprit is changes in agricultural practices and plant breeding that focused on yield and appearance rather than nutritional value.

The study you'll see quoted for this is a 2004 paper by Donald Davis and colleagues at the University of Texas, published in the Journal of the American College of Nutrition. They compared USDA nutrient data for 43 garden crops between 1950 and 1999 and found consistent declines across protein, calcium, phosphorus, iron, riboflavin, and vitamin C over that fifty-year period. For broccoli specifically, the commonly reported figures are roughly a 16% decline in calcium, 20% in iron, 21% in vitamin A, 15% in vitamin C, 38% in vitamin B2 (riboflavin), and 9% in protein.

Those are real numbers from a real study, and I think they're worth knowing. But I want to give you the honest caveat too, because this study gets quoted much more confidently than it deserves. It compared two sets of USDA food composition tables from different eras, and those datasets were built using different varieties, different growing conditions, and different analytical methods. The study's own authors were careful to note that the decline can't be pinned on soil depletion alone — the shift toward higher-yielding varieties is a major factor, and a modern high-yield plant puts more of its energy into bulk than into mineral concentration. A later review also pointed out how enormous the natural variation is between varieties and growing conditions, which makes broad historical comparisons tricky. So: the decline is credible and widely accepted, the specific cause is more complicated than "dead soil," and breeding may matter more than minerals. I still think it's a good reason to grow your own.

The good news is that regenerative farming is beginning to gain traction. Where commercial farming is designed to maximize yield and profit for large markets, regenerative farming aims to restore the health of the ecosystem while still producing food. Early evidence suggests it produces more nutrient-dense crops and may even increase yields. In some small studies, regeneratively grown crops have shown meaningfully higher levels of certain minerals, particularly magnesium and zinc. I'd take that as promising rather than proven — the research is young — but it lines up with everything else I've seen in soil.

What you put in your soil matters. If you copy the practices of commercial farming you likely won't do your garden any favors. Learning from regenerative farming methods and sticking with natural amendments like compost will help you get the best results and the most value for your money.

If you want to do more research into genuinely organic, regenerative farming practices, look into The Real Organic Project.

And Finally: Your Goals

The last item on the list, and probably the most important.

It's tempting to just go out and start flinging seeds around. Most of the clients I've worked with have impulse-bought seeds or plants without any kind of plan. I do this every year because I can't help myself. However, I don't recommend it. This is a classic case of “do as I say, not as I do.”

Even a vague sense of what you want out of a garden will help you make better decisions. Knowing what I wanted from a garden even determined which lot I bought to build my house on, so yes, this can be a big deal. Here are a few examples.

A client wanted a variety of fruit trees and was determined to plant twelve of them in their side yard, since it was the sunniest spot on the property. That sounded reasonable, until we found out that's where their septic field was. You can't plant trees on a septic field, and you shouldn't plant them near one either, because the roots can clog the drain lines and cost you an enormous amount of money to fix. The sunniest spot on the property isn't always the right spot for the trees. Knowing the client's goal — a variety of fruit — let me recommend an alternative that met their goals without so many risks: plant the fruit trees in another suitable location, and use the sunny side yard for some smaller, shallow-rooted plants that wouldn't threaten the septic system.

A foodie client wanted a large vegetable garden plus fruit trees, and had around an acre and a half to work with. That's plenty of space, but the layout still matters. We needed to think about where the house shadow fell, what the slope of the land meant for drainage, where access to water was, and where compost and other materials would need to be staged, not to mention we had to consider how they were going to get materials to all of these places. Goals turn into a plan, and a plan tells you what to put where.

I once had a client who wanted the traditional front lawn, at whatever cost. After a soil test revealed how poor the soil was, I was able to explain the long-term consequences of the typical lawn care industry approach and help him understand the challenges his soil conditions created — and the benefits of improving the soil instead. His goal stayed the same; his path to getting there changed, and the result was better soil, a healthier lawn, and less money spent to get what he really wanted.

So take some time and get clear on what you actually want. Then build the garden around that.

One More Thing: Container Growing

Everything above assumes you're working with ground. A lot of you aren't, and I don't want to leave you out, because container growing changes the rules in ways worth knowing. I started out with containers on my balcony in a city so this is an area that I genuinely care about.

You can't really "test and amend" potting mix the way you would soil, because it's a manufactured medium designed to drain fast and hold little. That's the tradeoff: containers drain so freely that nutrients wash out with every watering, which is why container plants need feeding far more often than garden plants do. Slow-release or regular liquid feeding through the season is normal for containers, not a sign you did something wrong.

The pH advice still applies, though differently. Potting mixes are usually buffered to a workable range already, but acid-loving plants like blueberries in containers still need an acidic medium, and most general potting mixes are not it.

Where containers shine is control. You're no longer at the mercy of your native clay or sand. If your ground is hopeless, containers are a completely legitimate answer rather than a consolation prize — start with the best mix you can reasonably afford and a container big enough that the root zone doesn't dry out daily. I’ll write a more detailed post about container gardening in the future. 

Putting It All Together

Do these things before you spend a dollar:

1. Look up your hardiness zone, and check that it's current and remember that this is just a starting point.
2. Find your first and last frost dates, and treat them as probabilities.
3. Test your soil — and remember it won't tell you about nitrogen.
4. Aim for the right pH range, because it governs everything else.
5. Get clear on your goals and let that guide your planting choices.

These steps may not be glamorous but figuring this all out before you start planting is certainly cheaper and less frustrating than winging it, failing, and starting over.

If you take care of the fundamentals first, everything after that gets easier — and your garden will reward you for it.