Crop | Compatible Companions | Incompatible | Why Incompatible |
|---|---|---|---|
| Asparagus | Tomato, parsley, basil | ||
| Beans | Most vegetables & herbs | Onion, garlic, gladiolus | Onions, garlic, and gladiolus can inhibit bean growth. |
| Beans, Bush | Irish potato, cucumber, corn, strawberry, celery, summer savory | Onion family | Onions can inhibit bush bean growth. |
| Beans, Pole | Corn, summer savory, radish | Onion, beets, kohlrabi, sunflower | Onions, beets, kohlrabi, and sunflowers can inhibit pole bean growth by releasing chemicals into the soil. |
| Beets | Cabbage & onion families, lettuce | Pole beans | Both can stunt the other's growth. |
| Cabbage family | Aromatic herbs, celery, beets, onion family, chamomile, spinach, chard | Strawberry, pole beans, tomato | Tomatoes, Pole Beans, and strawberries will stunt members of the Brassica family (cabbage, broccoli, kale, cauliflower). |
| Carrots | English pea, lettuce, rosemary, onion family, sage, tomato | Dill | Don't plant carrots next to dill because they are in the same plant family, which can cause them to cross-pollinate. This can stunt carrot growth. |
| Celery | Onion & cabbage families, tomato, bush beans, nasturtium | Corn | Competes for nutrients and sunlight. |
| Corn | Irish potato, beans, English pea, pumpkin, cucumber, squash | Tomato | Both plants are heavy feeders and can deplete the soil's nutrients. |
| Cucumber | Beans, corn, English pea, sunflowers, radish | Irish potato, aromatic herbs | Potatoes will compete for water and nutrients, and they have some of the same diseases as cucumbers. Aromatic herbs can inhibit growth and affect flavor. |
| Eggplant | Beans, marigold | Geraniums | Geraniums may spread commonflower diseases thatcan stunt eggplant growth. |
| Lettuce | Carrot, radish, strawberry, cucumber | Fennel, parsley, brassica | Fennel secretes a chemical that stunts growth. Parsley can cause lettuce to bolt. Brassica (cabbage, broccoli, kale, cauliflower) secrete a substance from their roots that prevents lettuce germination. |
| Onion family | Beets, carrot, lettuce, cabbage family, summer savory | Beans, English pea | Onions can inhibit the growth of beans and peas. |
| Parsley | Tomato, asparagus | ||
| Pea, English | Carrots, radish, turnip, cucumber, corn, beans | Onion family, gladiolus, Irish potato | Onions and gladiolus can inhibit pea growth. |
| Potato, Irish | Beans, corn, cabbage family, marigolds, horseradish | Pumpkin, squash, tomato, cucumber, sunflower | Pumpkin has a high water requirement, which can increase the risk of brown rot in potatoes. The others compete for nutrients and have similar diseases. |
| Pumpkins | Corn, marigold | Irish potato | Potatoes can increase the chance of blight in pumpkins when planted together. |
| Radish | English pea, nasturtium, lettuce, cucumber | Hyssop | Hyssop can inhibit radishes' growth. |
| Spinach | Strawberry, fava bean | NONE | |
| Squash | Nasturtium, corn, marigold | Irish potato | Potatoes can deplete the soil of nutrients and starve nearby squash. |
| Tomato | Basil, onion family, nasturtium, marigold, cucumber, carrot, asparagus, parsley, | Corn, Irish potato, fennel, cabbage family | The Cabbage family and fennel can stunt tomato growth. Potatoes are susceptible to the same diseases as tomatoes. Corn is a heavy feeder and competes for nutrients. |
| Turnip | English Pea | Irish potato | Both can compete for nutrients and space. |
UC Master Gardeners of Tulare and Kings County