Garden Myth Busting

While blueberries do love acidic soil (pH 4.5-5.5), pouring lemon juice on them is not the way to get there. The acidity is temporary, washes away quickly, and can actually harm beneficial soil microbes. Instead, use elemental sulfur or an acidifying fertilizer designed for blueberries. It takes longer but it actually changes the soil chemistry in a lasting way. I tested this side-by-side in my own garden, and the lemon juice bed showed zero pH change after a week.

This one actually holds up! Basil can help repel certain pests like aphids and whiteflies, and they share similar watering and sun needs. Some studies suggest basil may even improve tomato flavor, though the science there is still emerging. What I know for sure is that they thrive in the same conditions — full sun, consistent moisture, warm soil. Plus, they taste amazing together. Plant them together, harvest them together, eat them together.

Most plants in the ground don't need daily watering — in fact, overwatering is one of the most common mistakes new gardeners make. It leads to root rot, fungal issues, and weak root systems that never learn to grow deep. Containers are different (they dry out faster), but even then, you should check the soil first. Stick your finger in — if it's moist an inch down, wait. Deep, infrequent watering encourages roots to grow down and makes your plants way more resilient.

Coffee grounds can be great for acid-loving plants like blueberries and azaleas when composted first. But fresh grounds can be too acidic and even inhibit growth for many plants. They can also compact on the soil surface and create a barrier that repels water. The best way to use coffee grounds is to add them to your compost pile, where they break down with other materials. In compost, they are a great source of nitrogen. Just don't dump a pile of fresh grounds around your tomatoes and expect magic.

Marigolds are great, but they are not a magic pest force field. French marigolds (Tagetes patula) do produce a compound called alpha-terthienyl that can suppress root-knot nematodes in the soil — but only if you grow them as a cover crop and till them in. They may deter some whiteflies and can attract beneficial insects like hoverflies. But they will not stop deer, squirrels, hornworms, or most common garden pests. Think of them as one tool in your toolkit, not a silver bullet.

This one drives me crazy because my entire garden started in containers, and I grew more food in pots on my patio than some people do in full garden beds. Tomatoes, peppers, herbs, lettuce, strawberries, even small melons — they all do great in containers if you give them the right size pot, good soil, and consistent watering. I currently grow food in over 40 containers. The key is using large enough pots (at least 5 gallons for tomatoes and peppers) and a quality potting mix.

I see this advice everywhere and I wish it worked that fast, but it doesn't. Eggshells are almost pure calcium carbonate, which is great, but they take years to break down in soil. Crushing them up and sprinkling them around your tomatoes will not prevent blossom end rot this season. Blossom end rot is usually a watering issue anyway, not a calcium deficiency. If you want to add calcium quickly, use gypsum or a calcium-specific fertilizer. Save the eggshells for your compost bin where they will break down over time.

Most fruiting vegetables like tomatoes, peppers, and squash do need 6-8 hours of direct sun. But there is a whole world of vegetables that thrive in partial shade (4-6 hours). Lettuce, spinach, kale, arugula, radishes, and most herbs actually prefer some afternoon shade, especially in hot summers. If your only sunny spot gets 4-5 hours of morning sun, you can absolutely grow a productive salad garden there. Don't let a shady yard stop you from growing food.

Some companion planting pairings have real science behind them — like the Three Sisters (corn, beans, squash) where beans fix nitrogen and squash shades the soil. And we know that certain plants can attract beneficial insects or repel specific pests. But a lot of the traditional companion planting charts you see online are based on folklore and gardening tradition, not controlled studies. That does not mean they are wrong — generations of gardeners noticed these patterns for a reason. Just take the more specific claims with a grain of salt and test what works in your own garden.

Whether you are filling raised beds or planting in containers, fresh bagged soil is not always ready to go as-is. Many potting mixes lack sufficient nutrients beyond the first few weeks, and some bargain soils have poor drainage or compaction issues. I always mix in compost (about 30% by volume) and a slow-release organic fertilizer when starting with new soil. For raised beds, a mix of topsoil, compost, and peat moss or coco coir gives you a great foundation. Test your soil if you can — it takes the guesswork out of what your plants actually need.