Every spring, I see the same scene in garden centers. Carts piled high with lime, fertilizer, gypsum, compost-in-a-bag, and something in a shiny package that promises instant results. When I chat with home gardeners, I often ask: How did you decide you needed all of that? Most of the time, the answer is, “I don’t really know. It looked helpful.”
As someone who works with soil tests every day, I see the other side of that story. I see the lawn with three times more phosphorus than it needs. The vegetable bed that gets lime every year, even though the pH is already high.
A lot of this comes down to a few myths that are passed down by neighbors, family, and well-meaning advice on the internet. But they quietly drain gardeners’ wallets and sometimes weaken the very plants people are trying to help. Here are five of the most common myths, and what to do instead.
Myth 1: “If my plants look okay, I don’t need a soil test.”
Plants will try their best in less-than-ideal conditions. By the time plants show clear distress, the problem is often advanced. pH has drifted far from the ideal range. One nutrient is so high that it is starting to interfere with others. In the lab, I see plenty of samples from landscapes that “seem fine,” where the numbers tell a very different story. I also see the opposite. People are convinced their soil is terrible, but the test says they are in good shape and only need minor tweaks.
This myth costs money because skipping the test means guessing. Guessing leads to buying products you do not need and missing the changes that would help the most. A better approach is to test your soil every few years, or sooner if you are starting something new. A good test provides clear recommendations matched to what you are growing.
Myth 2: “More fertilizer equals better plants.”
People worry they are not fertilizing enough, so “a little extra” feels like good insurance. Extra nutrients do not automatically translate to extra health. Instead, excess fertilizer can burn roots and foliage, push lush but weak growth that attracts pests and disease, and wash into streams and lakes where it fuels algae blooms, harming the environment.
This myth costs money as you are paying for nutrients your plants cannot use. You may also pay later for disease control or to repair damaged turf and stressed garden beds. A better approach is to view soil test recommendations as a ceiling, not a suggestion to exceed.
Myth 3: “You should lime your soil every year.”
Many people learned that you “always lime the lawn in the fall.” As many native New England soils are naturally acidic, lime can be important in the right amount and in the right places. But I also see plenty of tests where pH is already in the upper 6s or above 7, and the lawn is still getting lime out of habit.
When pH gets too high for the plants, iron and other micronutrients become less available. Acid-loving plants like blueberries and rhododendrons struggle. This myth costs money twice. First, you pay for lime, then you may pay to fix the problems caused by a high pH. A better approach is to test soil pH and apply only when it is recommended.
Myth 4: “Adding sand will fix heavy clay soil.”
Clay dries slowly in spring, sticks to tools when wet, and can feel like a brick when dry. A bag of sand looks like an easy fix, but mixing a little sand into a lot of clay does not make loam. It often makes something closer to concrete. What truly helps clay is organic matter. Compost and well-rotted manure can loosen heavy soils, improve drainage, and support healthier soil structure and biology.
This myth costs money because you buy sand, haul it around, and see little improvement. For most home gardens, adding organic matter works much better.
Myth 5: “Bagged topsoil or garden soil is always an upgrade.”
Big bags and bulk deliveries of “topsoil,” “garden soil,” or “planting mix” can feel like a shortcut to perfect beds. Sometimes they are excellent, but at other times they are basically subsoil with a nicer name, which can cause problems like high salt levels, unbalanced nutrients, or a pH far from the target.
This myth costs money because poor-quality material means paying twice. Once to bring it in, and again to correct it. A better approach is to ask suppliers what is in the mix and how it is produced. And whenever possible, improve the soil you already have.
The common thread
The common thread in all five myths above is that we reach for products before we understand the soil. If you start with a test, you can skip lime when your pH is already in range, cut back on fertilizer where nutrients are high, and put your time and money into the changes that will actually move the needle. That is better for your plants, your budget, and the rivers and lakes downstream. Your garden does not need every product on the shelf. It just needs the right help at the right time.
The UConn Home & Garden Education office supports UConn Extension’s mission by providing answers you can trust with research-based information and resources. For gardening questions, contact us toll-free at (877) 486-6271, visit our website at homegarden.cahnr.uconn.edu, or reach out to your local UConn Extension Center at extension.uconn.edu/locations.
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