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Companion Planting

The table below lists some commonly held beliefs about the uses of companion plants.

Plant Name	Companion to:	What It Is Believed To Do (Good & Bad)
Allium--flowering onions, chives, garlic, leek, onion and shallot	Roses, carrots, tomato, fruit trees, other vegetables	Repels aphids, weevils, carrot flies, moles, fruit tree borers; controls rust flies and some nematodes; protects tomatoes against red spiders. Protects roses from black spot, mildew and aphids. BUT is believed to inhibit growth of peas & beans.
Basil	Tomato, asparagus	Repels aphids, flies, mosquitos and mites; helps control insect pests such as tomato hornworms, asparagus beetles, and disease.
Bush beans (Butter, green, snap, string,wax)	Beets, carrots,cucumber, corn, eggplant, potato,strawberry	Encourages growth of companion plant. Adds nitrogen to the soil. Green beans protect eggplant from the Colorado potato beetle.
Borage	Tomato, strawberry, fruit orchards	Repels tomato worms. Adds potassium, calcium and other minerals to soil. Attracts honeybees.
Broad beans	Corn	Add nitrogen to soil--which is needed by corn. Bean vines grow up corn stalks, thus anchoring corn more firmly and the vines discourage racoons.
Chamomile	Cabbage, onions	Improves growth and flavor--but plant only one plant every 150 feet or so.
Castor Bean	Vegetables	Repels moles and plant lice. CAUTION: All parts of the castor bean plant are poisonous, especially the seeds!
Catnip	Eggplant	Fresh catnip steeped in water and sprinkled on plants will drive away flea beetles.
Celery	Cabbage, leeks, tomato, cauliflower	Improves growth of companion plants. Repels white cabbage butterflies.
Chervil	Radish	Improves growth and flavor.
Chive	Carrots	Improves growth and flavor.
Coriander	Vegetables	Repels aphids. Attracts bees.
Cucumber	Corn, beans, peas, radish, sunflowers	Improves growth. Vines growing with corn help anchor corn and discourage racoons.
Datura	Various plants	Deters Japanese beetles. CAUTION: All parts of the Datura plant are poisonous!
Dill	Cabbage	Improves growth. Blossoms attract honeybees.
Fennel		Most plants dislike fennel--so plant it away from the vegetable garden. Its foliage and flowers may attract beneficials.
Geranium	Cabbage, cron, grapes, roses	Repels cabbage worms, Japanese beetles.
Horseradish	Potato	Encourages growth. May repel Colorado potato beetles and blister beetles.
Hyssop	Cabbage, grapes	Improves growth, deters cabbage moth.
Leek	Carrots, celery, onions	Improves growth, repels carrot flies.
Marigold	Tomato, potato, strawberry, beans, roses	Encourages growth, deters Mexican bean beetles and other pests.. Discourages harmful nematodes, if they are grown for several seasons in the ground in areas that have nematode infestations.
Mint	Tomato, cabbage	Improves flavor and growth
Mustard	Cabbage, cauliflower, radish, Brussels sprouts, turnips, collards, kohlrabi	Plant mustard as a trap crop. It attracts numerous insect pests. Remove and destroy it before your main crops can be harmed.
Nasturtiums	Cucumber, Squash, other vegetables, fruit trees.	Repels aphids,cucumber beetles,whiteflies and squash bugs. Acts as trap crop for aphids. Repels borers near fruit trees.
Onion	Cabbage, cauliflower, broccoli,beets, tomato, lettuce, strawberry, chamomile, summer savory	Repels aphids, weevils, carrot flies, moles, fruit tree borers; controls rust flies and some nematodes; protects tomatoes against red spiders. BUT is believed to inhibit growth of peas & beans.
Oregano	Broccoli	Repels cabbage butterfly.
Parsley	Asparagus carrots, tomato, roses.	Deters asparagus beetles.Improves growth. Deters carrot flies and rose beetles.
Peanuts	Corn, squash	Encourages growth of corn and squash.
Peas	Corn	Adds nitrogen to soil for use by hungry corn plants. Grows well with carrots, turnip, radish, cumcumber, beans and potatoes.
Peanut	Various plants	Excellent soil builder. Can make a good ground cover in a nut tree orchard.
Pennyroyal	Broccoli, Brussels sprouts, cabbage, other plants.	Discourages ants, plant lice, cabbage maggots.
Pyrethrum	Various plants	Repels aphids, leafhoppers, spider mites, harlequin bugs, ticks, pickleworms and imported cabbage worms.
Radish	Cucumber	Deters cucumber beetles.
Rosemary	Carrots, cabbage, beans	Repels carrot flies, bean beetles, cabbage moths.
Rue	Roses, raspberries	Repels Japanese beetles.
Sage	Carrots, various	Repels carrot flies, cabbage moths, ticks.
Snap beans	Corn	Enhances growth of corn.
Soybeans	Corn	Enhances growth of corn and other heavy feeders by adding nitrogen to the soil. Repels chinch bugs and Japanese beetels.
Spearmint	Various plants	Deters ants, aphids.
Sweet pepper	Basil, okra	Improves growth.
Summer savory	Green beans	Improves growth, deters bean beetles.
Tansy	Cucumber, squash, roses, grapes, raspberry, blackberry.	Deters flying insects, striped cucumber beetles, ants, flies, squash bugs and Japanese beetles. BUT, attracts imported cabbageworms.
Toads (Okay, toads aren't plants--but they sure make the greatest companions to many plants.)	Various plants	One toad may eat as many as 10-thousand insects in a three-month period! Insects on toad's menu include cutworms, crickets, grubs, rose chafers, rose beetles, caterpillars, ants, squash bugs, sow bugs, potato beetles, moths, mosquitos, flies, slugs and even moles.
Tomato	Roses	Protects roses from black spot.
Thyme	Cabbage	Controls flea beetles, cabbage maggots, imported cabbageworms and white cabbage butterflies.
Walnut, Black		Black walnut trees inhibit the growth of apples, potato, tomato, blackberry.
Wormwood	Various plants	Deters black flea beetles, malaria mosquitos, cabbage worm butterflies.