Companion planting is a gardener’s secret weapon — but just like people, not all vegetables get along. Some plants compete for nutrients, attract harmful pests, or stunt each other’s growth. Knowing which veggies shouldn’t share a bed can mean the difference between bare soil and a bumper harvest. Here are ten pairings you’ll want to avoid.
1. Tomatoes and Corn
Both attract the same pest: the corn earworm, also known as the tomato fruitworm. Planting them together invites double trouble and nutrient competition.
2. Onions and Beans
Onions release compounds that can inhibit bean growth, while beans prefer low-sulfur environments. Keep them distant for happier harvests.
3. Carrots and Dill
Dill promotes carrot pests and can stunt root development if grown too close. Plant these herbs apart to protect your crunchy crop.
4. Potatoes and Tomatoes
Both are nightshades, meaning they suffer from similar diseases like blight. Keep them separated to prevent spreading infection.
5. Cabbage and Strawberries
Strawberries dislike sharing space with cabbage family plants; they often compete for nutrients and attract unwanted insects.
6. Cucumbers and Potatoes
Cucumbers can make potatoes more susceptible to blight and share space poorly due to their sprawling vines.
7. Peppers and Fennel
Fennel releases substances that hinder pepper growth. It’s better grown in its own section as a pollinator attractor.
8. Beans and Garlic
Garlic’s antibacterial compounds protect many plants but can slow down or inhibit legumes like beans and peas.
9. Lettuce and Parsley
Parsley grows vigorously and can shade or crowd out tender lettuce. Give lettuce more personal space to stay crisp.
10. Corn and Celery
Corn’s high nutrient demand and tall growth can deprive celery of light and nitrogen. Separate them for stronger yields.
Planting with compatibility in mind keeps your garden balanced, healthy, and far more productive. A little spacing strategy goes a long way to easy garden wins!
