Summer Tomato Growing Mistakes and Cheap Fixes

I killed a lot of tomato plants before I figured out it was my fault. Not the weather, not bad luck, not some mysterious blight that only targets my garden. Me. These are summer tomato growing mistakes I kept making every June, wondering why my plants looked rough by August.

If your tomatoes are struggling right now, there’s a decent chance you’re making at least one of these mistakes. Good news: the fixes are cheap. Most of them are free. That’s kind of my whole thing.

Watering Every Day Whether They Need It or Not

This was my first mistake and I did it for years. Every morning, a little water. Felt responsible. Felt like good parenting, basically. What it actually does is keep the soil surface damp while the roots stay shallow and weak because they never need to go looking for anything.

Deep, infrequent watering grows better roots. Soak the base once or twice a week and let it dry out a bit in between. Stick your finger two inches into the soil. If it still feels moist down there, skip the water. That’s the whole system. No gadget required, though a cheap soil moisture meter actually helps if you tend to overthink it like I do.

Skipping the Mulch

Unmulched tomatoes dry out faster, splash soil-borne disease onto leaves when it rains, and just generally have a harder life. A couple inches of straw or shredded leaves around the base costs almost nothing. Bags of straw are usually a few bucks at the local nursery, and shredded leaves cost exactly zero dollars if you saved any from last fall.

I use whatever I have. One year it was cardboard strips topped with grass clippings. Looked ridiculous. Worked great. The tomatoes did not care how it looked. (Neither did I, honestly.)

Never Pruning the Suckers

If you’re growing indeterminate tomatoes (the tall climbing kind), those little shoots that sprout in the crotch between the stem and a branch will eventually turn into full branches. Which sounds great until your plant is a six-foot jungle producing approximately four tomatoes.

Pinch or snip the suckers when they’re small and the plant puts more energy into the fruit it’s already working on. I use my fingers for the tiny ones. For bigger ones, a cheap pair of pruning snips works fine. If you’re not sure whether your variety is indeterminate, check the seed packet or tag. If you threw those away, same. I never keep them either.

Planting Too Close Together

I know the urge. Space feels wasteful. More plants equals more tomatoes, right? Except when they’re crammed together, air circulation drops, moisture hangs around, and fungal disease moves through your plants like it’s on a mission. Two feet minimum between plants. Three feet is better. That’s not me being dramatic, that’s just airflow math.

The cheap fix here is accepting you already made this mistake and pulling one plant if things look bad. It feels terrible. Do it anyway. I’m speaking from experience and also mild personal regret. A pruned plant today is a ketchup-worthy harvest in August. Anyway.

Fertilizing With Nitrogen All Season

High nitrogen fertilizer in spring makes sense. Lots of leafy green growth, strong stems. Keep doing it once the plant starts flowering and you’ll get enormous beautiful leaves and almost no fruit. Tomatoes need phosphorus when they’re setting fruit, not nitrogen. Tomato-specific fertilizers shift the ratio at the right time, which is why the label says “tomato” and not just “plant.”

Compost is the lazy cheap answer here. A handful worked into the soil at planting and a light top-dress mid-season covers a lot of ground without overthinking ratios. Free if you’ve got a pile going. Which you should. But that’s a different post.

Letting Problems Sit Because “It’ll Probably Be Fine”

Yellow leaves, curled leaves, spots, stunted fruit. I ignored all of these at various points and told myself the plant would sort it out. Tomatoes are resilient but they’re not magic. A small problem in June is a big problem in August. Catching it early almost always means a cheaper, easier fix. These are exactly the kind of summer tomato growing mistakes that cost you the most come harvest time. I learned this the hard way. More than once.

If your plants are already showing mid-season symptoms, I wrote up a whole rundown on tomato problems in July with cheap fixes that goes deeper into diagnosing what’s actually going on. Worth a look if something seems off and you can’t quite name it.

One More Thing

If you’re still in the planning-what-to-plant-alongside-your-tomatoes phase, growing cucumbers cheap is a good read. They play well with tomatoes in terms of space and timing, and the cost breakdown there might save you a few bucks at the local big box store or garden center.

Anyway. Tomatoes are forgiving if you catch things early. The plants aren’t judging you. Though after some of the things I’ve done to mine over the years, they probably should be.

Photo by Josephine Baran on Unsplash