Some plants just don’t get along—and pairing the wrong ones can lead to stunted growth, pest problems, or even a garden disaster. Whether you’re planning a vegetable bed or a flower patch, knowing what not to plant together can save you time, effort, and frustration.
These combos fight for nutrients, attract pests, or just cause chaos. Skip them to keep your garden healthy and blooming strong.
Tomatoes and Corn
Both of these heavy feeders compete for the same nutrients in the soil, leaving each other malnourished. Even worse, they attract the same pests—especially corn earworms and tomato fruitworms. Planting them together is an open invitation for infestation.
Carrots and Dill
While dill attracts beneficial insects, it can stunt carrot growth when planted too close. The two are in the same family and tend to compete underground. Your carrots might end up small, twisted, or oddly shaped.
Beans and Onions
Beans fix nitrogen in the soil, which is great for many plants—but not onions. Onion-family crops like garlic, shallots, and leeks can inhibit bean growth. It’s best to plant them in separate beds.
Cucumber and Sage
Sage is a strong-scented herb that repels some pests, but it also inhibits the growth of cucumbers. Cucumbers prefer milder companions and don't do well next to aromatic herbs. Keep them apart to give your cukes room to thrive.
Potatoes and Tomatoes
These relatives in the nightshade family share similar diseases, including blight. If one gets infected, it’s likely to spread to the other. Plus, they compete heavily for nutrients and space.
Lettuce and Broccoli
Lettuce is a light feeder, but broccoli is a nutrient hog. Broccoli can easily outcompete lettuce for nutrients and water, leaving your greens pale and weak. They’re best grown with companions that have similar needs.
Sunflowers and Potatoes
Sunflowers release substances into the soil that can inhibit the growth of neighboring plants—a process known as allelopathy. Potatoes are especially sensitive to this. Keep these two well apart to avoid reduced yields.
Fennel and Almost Anything
Fennel doesn’t play well with others—its allelopathic compounds can inhibit the growth of most vegetables and herbs. It’s best grown in its own corner of the garden, away from everything else. Even beneficial insects are wary of it.
Peppers and Beans
Beans grow fast and can overshadow slow-growing pepper plants. They also compete for space and may reduce airflow, encouraging disease. To keep your peppers productive, give them some breathing room.
Rosemary and Mint
These herbs both thrive in containers but have completely different needs—rosemary likes dry soil, while mint loves moisture. If planted together, one will almost always suffer. Grow them in separate pots to keep both happy.
Avoiding the wrong plant pairings can make a big difference in your garden’s success. Steer clear of these troublesome combos to help your plants grow stronger, healthier, and with fewer headaches.
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