A Practical Guide to Unfavorable Vegetable Plant Pairings
As experienced gardeners know, not all plants make good neighbors. While some conflicts have clear explanations—such as Alliaceae (garlic, onions, shallots) releasing root bactericides that harm Fabaceae legumes (peas, beans, broad beans) by disrupting their azotobacter bacteria—others stem from observed field results. Planting same-family crops together also amplifies pest risks, like the Colorado potato beetle attacking both potatoes and eggplants.
Practical observation trumps theory here. Where no associations are listed, reliable sources yielded no data for that crop.
Vegetables | Unfavorable Associations
| Vegetable | Unfavorable Associations |
|---|---|
| Garlic | Asparagus, beans, peas, cabbage |
| Asparagus | Garlic, onion |
| Eggplant | Potato |
| Beetroot | Bean, leek, carrot, tomato |
| Carrot | Beet |
| Celery | Corn, lettuce |
| Chicory | Cabbage |
| Cabbage | Chicory, fennel, strawberry, leek, grapes, garlic |
| Cucumber | Potato, tomato, radish |
| Squash | Radish |
| Shallot | Beans, peas, cabbage |
| Spinach | |
| Fennel | Cabbage, beans, parsnips, tomato |
| Fava bean | |
| Strawberry | Cabbage |
| Bean | Garlic, shallot, fennel, onion, leek, peas, tomato |
| Lettuce | Parsley |
| Mash | |
| Corn | Beetroot, celery, potato |
| Melon | |
| Turnip | |
| Onion | Beans, peas, asparagus, cabbage, potatoes |
| Parsnips | Fennel |
| Parsley | Peas, lettuce, leek |
| Dandelion | |
| Leek | Cabbage, beets, beans, parsley |
| Peas | Garlic, shallot, bean, onion, parsley, potato, tomato |
| Potato | Garlic, eggplant, beetroot, cucumber, corn, onion, peas |
| Radish | Cabbage, squash, pumpkin |
| Salsify | |
| Tomato | Beet, cucumber, fennel, bean, pea |
