Companion planting

Like most things in nature, companion planting is not an exact science. However, you can use this list, along with you experience and the advice of other local gardeners to help you achieve successful partnerships in your garden. You’ll probably be surprised how much difference it can make when you get the right (or wrong) companions.

Note: Plant names in italic are medicinal rather than culinary

Apple
Plant away from: cedar, walnut

Arnica (Montana)
Plant away from:
 most plants
Note: suppresses growth of plants around it, attracts beneficial insects, contains thiopene which is toxic to pathological soil nematodes

Asparagus
Plant near: basil, parsley, tomato
Plant away from: garlic, onion, potato
Note: basil repels asparagus beetles

Basil
Plant near: most garden crops, esp asparagus, lettuce, oregano, peppers, petunias, tomatoes
Plant away from: rue
Note: improves the flavor and growth of garden crops, especially tomatoes and lettuce. Repels asparagus beetles, flies, thrips, mosquitoes. Attracts beneficial insects and butterflies.

Beans, Bush
Plant near: beets, cabbage, carrots, catnip, cauliflower, corn, cucumbers, marigolds, potatoes, savory, strawberries
Plant away from: fennel, garlic, leeks, onions, shallots
Note: potatoes and marigolds repel Mexican bean beetles. Catnip repels flea beetles.

Beans, Pole
Plant near: corn, marigolds, potatoes, radishes
Plant away from  : beets, garlic, kohlrabi, leeks, onions, shallots
Note: potatoes and marigolds repel Mexican bean beetles. Catnip repels flea beetles.

Beets
Plant near: broccoli, brussels sprouts, bush beans, cabbage, cauliflower, chard, kohlrabi, onions
Plant away from: charlock, field mustard, pole beans
Noote: will stunt beans growth, good for compost as it’s high in Mg

Borage
Plant near:  most plants, but especially cabbage, cucumber, strawberry, squash, tomatoes
Note: attracts beneficial insects, repels tomato worms and other pests, improves flavor and growth of companions.

Broccoli and Brussels Sprouts
Plant near: beets, buckwheat, calendula, carrots, chamomile, dill, hyssop, marigolds, mints, nasturtiums, onions, rosemary, sage, thyme, wormwood.
Plant away from: strawberries
Note: marigolds repel cabbage moths. Nasturtiums repel aphids.

Cabbage family
Plant near: aromatic herbs, celery, beets, onion family, sage, tomatoes, celery, chard, spinach, and other brassicas such as broccoli, brussels sprouts, collards etc
Plant away from: dill, strawberries pole beans, raddishes, tomatoes, peppers, mustards
Note: tomatoes and celery repel cabbage worms.

Calendula
Note: attracts beneficial insects, contains pyrethrum which is toxic to chewing insects and sap-suckers don’t like the smell

Cantaloupe (melon)
Plant near: corn

Capsicum Peppers 
Plant near: other peppers, basil, geraniums, marjoram,  petunias
Plant away from: tomato, beans, cabbage family
Note: attracts tomato hornworm

Caraway
Plant near: strawberries
Plant away from: dill
Note:  attracts beneficial insects

Carrots
Plant near: cabbage, chives, early potatoes, leeks, lettuce, onions, peas, radishes, rosemary, sage, salsify, wormwooddill, parsnip, radish
Plant away from: dill, parsnip, radish
Note: onions, leeks, and wormwood repel carrot flies

Chamomile
Plant near: basil, cabbage, cucumber, onion
Note: attracts beneficial insects, increases oil production in nearby herbs

Chilli Pepper
Plant near: cabbage, maize
Note:
repels cabbage moth

Chives
Plant near: apples, berries, carrots, grapes, peas, roses, tomatoes.
Note: Improves flavor and growth of companions. Deters aphids and Japanese beetles.

Collards
Plant near: aromatic herbs, celery, beets, onion family, sage, tomatoDill, strawberries pole beans, tomatoes, peppers, mustards
Plant away from: dill, strawberries pole beans, tomatoes, peppers, mustards

Corn
Plant near: beans, cucumbers, early potatoes, melons, peas, pumpkins, soybeans, squash.
Plant away from: tomatoes
Note: soybeans deter chinch bugs.

Cornflower
Note: attracts beneficial insects, contains thiopene which is toxic to pathological soil nematodes

Cucumbers
Plant near: beans, cabbage, corn, early potatoes, radishes, sunflowers.
Plant away from: late potatoes, sage
Note: Radishes deter cucumber beetles. Cucumbers encourage blight in late potatoes.

Dill
Plant near: broccoli, brussels sprouts, cabbage, cauliflower, corn, cucumber, lettuce, onions
Plant away from: caraway, carrots, tomatoes
Note: Improves flavor and growth of cabbage family plants, deters aphids, cabbage looper, spider mites, squash bugs, attracts beneficial insects but also tomato hornworm

Echinacea
Note: attracts hoverflies and parasitoid wasps, so they’re useful for pest control

Eggplant
Plant near: green beans, peppers, potatoes, tarragon, tomatoes
Note: green beans deter Colorado potato beetles.

Fennel
Plant near: dill
Plant away from: almost all other plants
Note: attracts beneficial insects, deters aphids

Garlic
Plant near: cabbage, cane fruits, celery, cucumbers, lettuce, fruit trees, roses, tomatoes
Plant away from: most other plants but especially peas, beans
Note: deters aphids, ants, cabbage looper, cabbage maggot, rabbits

Hyssop
Plant near: cabbage, grapes
Plant away from: raddishes
Note: repels cabbage moth larva, cabbage butterfly. Attracts honey bees and butterflies

Kale
Plant near: aromatic herbs, buckwheat, cabbage family, marigolds, nasturtiums
Plant away from: Keep away from: pole beans, strawberries

Kohlrabi
Plant near: cabbage/cauliflower companions (except tomatoes)
Plant away from: fennel, pole beans, tomatoes
Note: kohlrabi stunts tomatoes

Leeks
Plant near: apple trees, cabbage family carrots, celery, lettuce, summer savory
Plant away from: beans, English peas
Note: repels aphids, cabbage worms, carrot fly

Lettuce
Plant near: beets, carrotsparsnips, radishes, strawberries
Plant away from: cabbage family
Note: lettuce tenderizes summer radishes

Lovage
Plant near: almost all plants but especially beans
Plant away from: rhubarb
Note: attracts beneficial insects

Marigolds
Plant near: almost all plants but especially cabbage family, cucumbers, peppers, melons, squash, tomato
Note: stimulates vegetable growth and repels bean beetles, beet leafhoppers, aphids, potato bugs, squash bugs, and maggots. contains thiopene which is toxic to patalogical soil nematodes

Marjoram
Plant near: all garden crops
Note: stimulates vegetable growth.

Mustard
Plant near: alfalfa cover crops, fruit trees, grapes, legumes
Note: stimulates the growth of companion plants.

Nasturtiums
Plant near: apples, beans, cabbage family, greenhouse crops, potatoes, pumpkins, radishes, squash
Note: attracts beneficial insects. Repels aphids, cabbage looper, cucumber beetles, potato bugs, squash bugs, striped pumpkin beetles, Mexican bean beetles and destroys white flies in greenhouses.

Nettles
Plant near: aromatic herbs
Note
: improves oil production in herbs, great nitrogen source in compost

Onions
Plant near: beets, cabbage family, carrots, chamomile, lettuce, parsnips
Plant away from: beans, peas
Note: deters most pests, especially maggots. Improves oil production in herbs, great nitrogen source in compost

Oregano
Plant near: all garden crops
Note: deters many insect pests.

Parsley
Plant near: corn, roses, tomatoes

Parsnips
Plant near: onions, radishes, wormwood
Note: onions and wormwood help keep root maggots from parsnips.

Peas
Plant near: beans, carrots, corn, cucumbers, early potatoes, radishes, turnips
Plant away from: garlic, leeks, onions, shallots

Peppers (Capsicum)
Plant near: other peppers, basil, carrots, eggplant, geraniums, marjoram, onions, parsley, petunias, tomatoes (likes but attracts hornworm)
Plant away from: beans, cabbage family, fennel, kohlrabi

Potatoes
Plant near: basil, beans, cabbage family, corn, eggplant, flax, hemp, marigolds, peas, squash
Plant away from: apples, birch, cherries, cucumbers, pumpkins, raspberries, squash, sunflowers, tomatoes, turnips, walnuts
Note: hemp deters phytophthora infestans. Basil deters potato beetles. Marigolds (dug into crop soil) deter nematodes.

Pumpkin
Plant away from: potatoes

Radishes
Plant near: chervil, cucumbers, lettuce, melons, peas, squash, nasturtiums, root crops
Plant away from: cabbage, hyssop
Note: radishes deter cucumber beetles, black flea beetle. Chervil makes radishes hot. Lettuce helps make radishes tender. Nasturtiums improve radishes’ flavor.

Rosemary
Plant near: beans, cabbage, carrots, sage
Plant away from: basil
Note: repels bean beetles, cabbage flies, cabbage moths, and carrot flies.

Sage
Plant near: beans, cabbage family, carrots, rosemary, tomatoes
Plant away from: cucumbers
Note: Attracts beneficial insects. Deters ants, black flea beetle, cabbage fly, cabbage looper, cabbage maggot, cabbage moths. Invigorates tomato plants.

Soybeans
Plant near: corn, potatoes
Note: chokes weeds and enriches soil.

Spinach
Plant near: celery, cauliflower, eggplant, strawberries

Squash
Plant near: beans, buckwheat, catnip, corn, radishes, tansy
Plant away from: potatoes
Note: attracts spiders and ground beetles

Strawberries
Plant near: borage, bush beans, lettuce, pyrethrum, spinach
Plant away from: cabbage family

Sunflowers
Plant near: corn, cucumbers, tomatoes
Plant away from: potatoes
Note: attracts aphids, used as a trap crop. Contains thiopene which is toxic to pathological soil nematodes. Can provide a trellis and shelter for shade-loving cucumbers.

Swiss Chard
Plant near: bush beans, kohlrabi, onions
Plant away from: pole beans

Tansey
Plant near: beans, corn, cucumber, roses, squash
Note: repels many insects, attracts honeybee, contains thiopene which is toxic to pathological soil nematodes. Toxic for humans to eat.

Tarragon
Plant near: all garden crops especially eggplant
Note: improves vegetables’ flavor and growth. Repels many pests,

Thyme
Plant near: all garden crops
Note: deters cabbage moths.

Tomatoes
Plant near: asparagus, basil, borage, cabbage family, carrots, celery, geranium, gooseberries, marigolds, mustard, nasturtium, parsley, onions, oregano, parsley, peppers, petunias, rosemary, sage, stinging nettles
Plant away from: beets, cabbage family, cauliflower, corn, dill, fennel, kohlrabi, peas, potatoes, walnut

Turnips and Rutabagas
Plant near: peas
Plant away from: knotweed, mustard, potatoes
Note: mustard and knotweed inhibit the growth of turnips and rutabagas.

Walnut
Plant away from: almost all plants
Note: don’t use leaves in compost, contains juglone which is toxic or growth-stunting to many types of plants.

Wormwood
Note: attracts beneficial insects, contains thiopene which is toxic to pathological soil nematodes

Yarrow
Note: attracts beneficial insects, contains thiopene which is toxic to pathological soil nematodes

(sourcesource, source)

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