Garden Frenemies

Companion planting is a popular strategy to boost yields and deter pests, but getting it wrong can spell disaster. Some plants secrete chemicals that stunt the growth of their neighbors, or attract pests that decimate them.

1. Onions and Beans

Never plant alliums (onions, garlic, leeks) near legumes (peas, beans). Onions produce a chemical that actively stunts the growth of beans and prevents them from fixing nitrogen.

2. Tomatoes and Potatoes

Both are members of the nightshade family and are susceptible to the exact same blights and pests (like the Colorado Potato Beetle). Planting them together creates a buffet for pests and ensures disease spreads rapidly.

3. Fennel and... Everything

Fennel is the ultimate loner. It secretes an allelopathic chemical that inhibits the growth of almost all other garden vegetables. Keep fennel in its own isolated pot!