Organic gardeners can avert a great many crop ailments and pests by using thoughtful companion planting. The chart below, which includes information found in one of my favorite garden resource books, The Vegetable Gardener’s Bible by Edward C.
Companion Planting
Smith, as well as from a variety of other sources, can help you determine which vegetables to plant together, and which ones to space far apart for maximum effectiveness at deterring various insects and diseases.
Asparagus

Garden Friends: Basil, nasturtium, parsley, tomato
Garden Adversaries: Garlic, onion
Bean, bush

Garden Friends: Beet, cabbage, carrot, cauliflower, celeriac, celery, chard, corn, cucumber, eggplant, leek, marigold, parsnip, pea, potato, radish, rosemary, strawberry, sunflower
Garden Adversaries: Basil, fennel, kohlrabi, onion family (see bottom of this chart for members)
Bean, pole

Garden Friends: Carrot, cauliflower, chard, corn, cucumber, eggplant, marigold, pea, potato, rosemary, strawberry
Garden Adversaries: Basil, beet, cabbage, fennel, kohlrabi, onion family, radish, sunflower
Beet

Garden Friends: Bush bean, cabbage family (see bottom of this chart for members), corn, leek, lettuce, lima bean, onion, radish
Garden Adversaries: Mustard, pole bean
Broccoli

Garden Friends: Beet, bush bean, carrot, celery, chard, cucumber, dill, kale, lettuce, mint, nasturtium, onion family, oregano, potato, rosemary, sage, spinach, tomato
Garden Adversaries: Lima, pole, and snap bean, strawberry
Brussels Sprouts

Garden Friends: Beet, bush bean, carrot, celery, cucumber, lettuce, nasturtium, onion family, pea, potato, radish, spinach, tomato
Garden Adversaries: Kohlrabi, pole bean, strawberry
Cabbage

Garden Friends: Beet, bush bean, carrot, celery, cucumber, dill, kale, lettuce, mint, nasturtium, onion family, potato, rosemary, sage, spinach, thyme
Garden Adversaries: Pole bean, strawberry
Canteloupe

Garden Friends: Corn
Garden Adversaries: Potato
Carrot

Garden Friends: Bean, Brussels sprouts, cabbage, chive, leaf lettuce, leek, onion, pea, pepper, red radish, rosemary, sage, tomato
Garden Adversaries: Celery, dill, parsnip
Cauliflower

Garden Friends: Beet, bush bean, carrot, celery, cucumber, dill, kale, lettuce, mint, nasturtium, onion family, potato, rosemary, sage, spinach, tomato
Garden Adversaries:
Celery

Garden Friends: Bush bean, cabbage family (especially cauliflower), leek, parsley, pea, tomato
Garden Adversaries: Carrot, parsnip
Corn

Garden Friends: Beet, bush bean, cabbage, cantaloupe, cucumber, morning glory, parsley, pumpkin, squash
Garden Adversaries: Tomato
Cucumber

Garden Friends: Bush bean, cabbage family, corn, dill, eggplant, lettuce, nasturtium, pea, radish, sunflower, tomato
Garden Adversaries: Potato, sage
Eggplant

Garden Friends: Bush bean, pea, pepper, potato
Garden Adversaries: None
Kale

Garden Friends: Beet, bush bean, cabbage, celery, cucumber, lettuce, nasturtium, onion, potato, spinach, tomato
Garden Adversaries: Pole bean
Kohlrabi

Garden Friends: Beet, bush bean, celery, cucumber, lettuce, nasturtium, onion, potato, tomato
Garden Adversaries: Lima, pole, and snap bean, strawberry
Leek

Garden Friends: Beet, bush bean, carrot, celeriac, celery, onion, parsley, tomato
Garden Adversaries: Pole bean
Lettuce

Garden Friends: Everything, but especially carrot, garlic, onion family, and radish
Garden Adversaries: None
Lima Bean

Garden Friends: Beet, radish
Garden Adversaries: None
Onion Family

Garden Friends: Beet, cabbage family, carrot, kohlrabi, leek. early lettuce, parsnip, pepper, spinach, strawberry, tomato, turnip
Garden Adversaries: Asparagus, bean, pea, sage
Parsley

Garden Friends: Asparagus, corn, tomato
Garden Adversaries: None
Parsnip

Garden Friends: Bush bean, garlic, onion, pea, pepper, potato, radish
Garden Adversaries: Caraway, carrot, celery
Pea

Garden Friends: Bean, carrot, celery, chicory, corn, cucumber, eggplant, parsley, radish, spinach, strawberry, sweet pepper, turnip
Garden Adversaries: Onion family
Pepper

Garden Friends: Carrot, eggplant, onion, parsnip, pea, tomato
Garden Adversaries: Fennel, kohlrabi
Potato

Garden Friends: Bush bean, cabbage family, corn, eggplant (as trap crop), marigold, parsnip, pea
Garden Adversaries: Cucumber, pumpkin, raspberry, rutabaga, squash family, sunflower, tomato, turnip
Pumpkin

Garden Friends: Corn, eggplant, nasturtium, radish
Garden Adversaries: Potato
Radish

Garden Friends: Bean, beet, cabbage family, carrot, chervil, corn, cucumber, leaf lettuce, melon, nasturtium, parsnip, pea, spinach, squash family, sweet potato, tomato
Garden Adversaries: Hyssop
Rutabaga

Garden Friends: Nasturtium, onion family, pea
Garden Adversaries: Potato
Spinach

Garden Friends: Cabbage family, celery, legumes, lettuce, onion, pea, radish, strawberry
Garden Adversaries: Potato
Squash

Garden Friends: Celeriac, celery, corn, dill, melon, nasturtium, onion, radish
Garden Adversaries: Potato
Strawberry

Garden Friends: Bean, borage, lettuce, onion, pea, spinach
Garden Adversaries: Cabbage family
Sweet Potato

Garden Friends: Aromatic herbs such as summer savory (helps deter sweet potato weevils), thyme, oregano, and dill.
Garden Adversaries: Squash, watermelon, or anything similar that has a vine that spreads on the ground
Tomato

Garden Friends: Asparagus, basil, bee balm, bush bean, carrot, celery, chive, cucumber, garlic, head lettuce, marigold, mint, nasturtium. onion, parsley, pepper, pot marigold
Garden Adversaries: Dill, fennel, pole bean, potato
Turnip

Garden Friends: Onion family, pea
Garden Adversaries: Potato

What is the Cabbage Family?
Broccoli, Brussels sprouts, cabbage, kohlrabi, cauliflower
What is the Onion Family?
Chives, leeks, garlic, onion, scallions