| Plant | Companion(s) and Effects |
| Asparagus | Tomatoes, parsley, basil |
| Basil | Tomatoes (improves growth & flavor); said to dislike rue; repels flies & mosquitoes |
| Bean | Potatoes, carrots, cucumbers, cauliflower, cabbage, summer savory, most other veggies & herbs |
| Bean (bush) | Sunflowers (beans like partial shade, unless you live up north, sunflowers attract birds & bees for pollination), cucumbers (combination of heavy and light feeders), potatoes, corn, celery, summer savory |
| Bee Balm | Tomatoes (improves growth & flavor). |
| Beet | Onions, kohlrabi |
| Borage | Tomatoes (attracts bees, deters tomato worm, improves growth & flavor), squash, strawberries |
| Cabbage Family (broccoli, brussels sprouts, cabbage, cauliflower, kale, kohlrabi) | Potatoes, celery, dill, chamomile, sage, thyme, mint, pennyroyal, rosemary, lavender, beets, onions; aromatic plants deter cabbage worms |
| Caraway | Loosens soil; plant here and there |
| Carrot | Peas, lettuce, chives, onions, leeks, rosemary, sage, tomatoes |
| Catnip | Plant in borders; protects against flea beetles |
| Celery | Leeks, tomatoes, bush beans, cauliflower, cabbage |
| Chamomile | Cabbage, onions |
| Chervil | Radishes (improves growth & flavor). |
| Chive | Carrots; plant around base of fruit trees to discourage insects from climbing trunk |
| Corn | Potatoes, peas, beans, cucumbers, pumpkin, squash |
| Cucumber | Beans, corn, peas, radishes, sunflowers |
| Dead Nettle | Potatoes (deters potato bugs) |
| Dill | Cabbage (improves growth & health), carrots |
| Eggplant | Beans |
| Fennel | Most plants are supposed to dislike it. |
| Flax | Carrots, potatoes |
| Garlic | Roses & raspberries (deters Japanese beetle); with herbs to enhance their production of essential oils; plant liberally throughout garden to deter pests |
| Horseradish | Potatoes (deters potato beetle); around plum trees to discourage curculios |
| Hyssop | Cabbage (deters cabbage moths), grapes; keep away from radishes |
| Lamb's Quarters | Nutritious edible weeds; allow to grow in modest amounts in the corn |
| Leek | Onions, celery, carrots |
| Lemon Balm | Here and there in the garden |
| Marigold | The workhorse of pest deterrents; keeps soil free of nematodes; discourages many insects; plant freely throughout the garden. |
| Marjoram | Here and there in the garden |
| Mint | Cabbage family; tomatoes; deters cabbage moth |
| Nasturtium | Tomatoes, radish, cabbage, cucumbers; plant under fruit trees; deters aphids & pests of curcurbits |
| Onion | Beets, strawberries, tomato, lettuce (protects against slugs), beans (protects against ants), summer savory |
| Parsley | Tomato, asparagus |
| Pea | Squash (when squash follows peas up trellis), plus grows well with almost any vegetable; adds nitrogen to the soil |
| Petunia | Protects beans; beneficial throughout garden |
| Potato | Horseradish, beans, corn, cabbage, marigold, limas, eggplant (as a trap crop for potato beetle) |
| Pot Marigold | Helps tomato, but plant throughout garden as deterrent to asparagus beetle, tomato worm & many other garden pests |
| Pumpkin | Corn |
| Radish | Peas, nasturtium, lettuce, cucumbers; a general aid in repelling insects |
| Rosemary | Carrots, beans, cabbage, sage; deters cabbage moth, bean beetles & carrot fly |
| Rue | Roses & raspberries; deters Japanese beetle; keep away from basil |
| Sage | Rosemary, carrots, cabbage, peas, beans; deters some insects |
| Soybean | Grows with anything; helps everything |
| Spinach | Strawberries |
| Squash | Nasturtium, corn |
| Strawberry | Bush beans, spinach, borage, lettuce (as a border) |
| Summer Savory | Beans, onions; deters bean beetles |
| Sunflower | Cucumber |
| Tansy | Plant under fruit trees; deters pests of roses & raspberries; deters flying insects, also Japanese beetles, striped cucumber beetles, squash bugs; deters ants |
| Tarragon | Good throughout garden |
| Thyme | Here and there in garden; deters cabbage worm |
| Tomato | Chives, onion, parsley, asparagus, marigold, nasturtium, carrot, limas |
| Valerian | Good anywhere in garden |
| Wormwood | As a border, keeps animals from the garden |
| Yarrow | Plant along borders, near paths, near aromatic herbs; enhances essential oil production of herbs |
from http://www.seedsofchange.com/enewsletter/issue_55/companion_planting.aspx
