Some plants hinder other plants’ growth and shouldn’t be grown next one another. Here are some “bad friends”:
Beans: onions, garlic
Cabbage: strawberries, tomatoes
Caraway: dill
Carrots: dill
Corn: tomatoes
Cucumbers: potatoes, sage
Hyssop: radishes
Onions: beans, peas
Peas: onions, garlic, leeks
Peppers: kohlrabi
Potates: pumpkins, squash, tomatoes
Radishes: cabbage
Rue: sweet basil
Squash: potatoes
Tomatoes: cabbage, cauliflower, fennel, potatoes
Turnips: potatoes