Companion Planting Chart

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Alliums (onions, garlic, leeks, shallots, chives, etc)

Helps: fruit trees, tomatoes, capsicum, peppers, potatoes, brassicas, carrots
Helped by:
carrots,tomatoes,carrots and African spider plants (Cleome gynandra) together, marigolds (Tagetes ssp),mints
Avoid:
peas, beans
Attracts:
Thrips
Repels:
rabbits, slugs, aphids, carrot-fly, cabbage loopers, cabbage maggots, cabbage worms, Japanese beetles
Comments:

 Asparagus

Helps: Tomatoes, parsley
Helped by:
Aster Family flowers, dill, coriander, tomatoes, parsley, basil, comfrey, marigolds, nasturtiums
Avoid:
onion, garlic, potatoes, gladiolas
Attracts:
coupled with basil seems to encourage lady bugs
Repels:
Comments:

Beans and other legumes

Helps: Beets, lettuce, okra, potato, spinach, dill, cabbage, carrots, chards, eggplant, peas, tomatoes, brassicas, corn, cucumbers, grapes
Helped by:
Summer savory, beets, cucumbers, borage, cabbage, carrots, cauliflower, corn, larkspur, lovage, marigolds, mustards, radish, potato, peppermint, rosemary, lettuce, onion, squash, lacy phacelia
Avoid:
Tomatoes, chili peppers, alliums, gladiolas
Attracts:
Snails and slugs
Repels:
Colorado potato beetle
Comments:
Hosts nitrogen-fixing bacteria, a good fertilizer for some plants, too much for others. Rosemary and peppermint extracts are used in organic sprays for beans. Summer savory and potatoes repel bean beetles.

 Beans, Bush

Helps: Cucumber, soybeans, strawberries
Helped by:
celery, strawberries, grains
Avoid:
fennel, soybeans, dry beans, alfalfa
Attracts:
Repels:
Comments:
Lettuce, potato, tomato, other legumes, crucifers, or cucurbits increase sclerotinia » in the soil and should be avoided before and after snap beans

Beans, Pole

Helps:
Helped by:
radishes
Avoid:
sunflowers, beets, brassicas, kohlrabi
Attracts:
Repels:
Comments:

Beets

Helps: Broccoli, bush beans, cabbage, lettuce, kohlrabi, onions, brassicas, passion fruit
Helped by:
bush beans, onions, kohlrabi, catnip, garlic, lettuce, most brassicas, mint
Avoid:
Runner or pole beans
Attracts:
Repels:
Comments:
Good for adding minerals to the soil through composting leaves which have up to 25% magnesium.

Brassicas (includes broccoli, Brussels sprouts, cabbage, cauliflower, Chinese cabbage, kohlrabi, radish, and turnip)

Helps: Beets, onions, potatoes, cereals (e.g. corn, wheat)
Helped by:
Beets, spinach, chard, Aromatic plants or plants with many blossoms, such as celery, chamomile, and marigolds. Dill, sage, peas, peppermint, spearmint, spurrey, rosemary, rye-grass, garlic, onions and potatoes. geraniums, alliums, nasturtium, borage, hyssop, tansy, tomatoes, thyme, wormwood, southernwood, beans, clover
Avoid:
Mustards, nightshades (tomatoes, peppers, etc.), pole beans, strawberries
Attracts:
Repels:
wireworms
Comments:
Thyme, nasturtiums, and onion showed good resistance to cabbage worm, weevil and cabbage looper.

Broccoli

Helps: Lettuce
Helped by: Mixture of mustard, pac choi, and rape. Beets, dill lettuce, mustard, onions, tomato, turnip, clover
Avoid:
Attracts:
Repels:
Comments:
Broccoli as a main crop intercropped with lettuce was shown to be more profitable than either crop alone.[33] Turnip acts as a trap crop

Brussels sprouts

Helps: Sage, thyme, clover, malting barley
Helped by:

Avoid:
Attracts:
Repels:
Comments:

Cabbage

Helps: Beans, celery
Helped by:
Beans, clover, calendula/pot marigold, chamomile, larkspur, nasturtiums, dill, coriander, hyssop, onions, beets, marigolds, mint, rosemary, sage, thyme, tomatoes, lacy phacelia, lettuce or garlic with Chinese cabbage. Green onions with Chinese cabbage
Avoid: grapes
Attracts:
Snails and slugs
Repels:
Comments:
If using clover as an intercrop it should be sown after cabbage transplant so as not to affect crop yield. Lettuce or garlic increased mortality of the diamondback moth on Chinese cabbage. Nasturtiums repel cabbage moths

Carrots

Helps: Tomatoes, alliums, beans, leeks, lettuce, onions, passion fruit
Helped by:
Lettuce, chives, leeks, onions, shallots, etc. rosemary, wormwood, sage, beans, flax
Avoid:
Dill, parsnip, radish
Attracts:
assassin bug, lacewing, parasitic wasp, yellow jacket and other predatory wasps
Repels:
leek moth, onion fly
Comments:
Tomatoes grow better with carrots, but may stunt the carrots’ growth. Beans provide the nitrogen carrots need more than some other vegetables. Aromatic companion plants repel carrot fly. Sage, rosemary, and radishes are recommended by some as companion plants, but listed by others as incompatible. Alliums inter-planted with carrots confuse onion and carrot flies. For the beneficial insect-attracting properties of carrots to work, they need to be allowed to flower; Otherwise, use the wild carrot, Queen Anne’s Lace, for the same effect. Flax produces an oil that may protect root vegetables like carrots from some pests.

Cauliflower

Helps: Beans, celery, spinach, peas
Helped by: Mixture of Chinese cabbage, marigolds, rape, and sunflower. Spinach,  peas
Avoid:
Attracts:
Repels:
Comments: One row of spinach alternating at 60 cm from each row of cauliflower proved mutually beneficial. See brassicas for more info. See peas regarding their mutualism with cauliflower.

Celery

Helps: Bush beans, brassicas, cucumber
Helped by: Cosmos, daisies, snapdragons, leeks, tomatoes, cauliflower, cabbage, bush beans
Avoid: corn, aster flowers
Attracts:
Repels: whiteflies
Comments: Aster flowers, can transmit the aster yellows disease

Chard

Helps: Brassicas, passion fruit
Helped by:
Avoid:
Attracts:
Repels:
Comments:

Corn

Helps: Beans, cucurbits, soybeans, tomatoes
Helped by: Sunflowers, dill, beans, peas, soybeans etc., peanuts, cucurbits, clover, amaranth, white geranium, pigweed, lamb’s quarters, morning glory, parsley, and potato, field mustard, Sudan grass
Avoid: Tomato, celery
Attracts:
Repels:
Comments: Provides beans with a trellis, is protected from predators and dryness by cucurbits, in the three sisters

Cucumber

Helps: Beans, kohlrabi, lettuce
Helped by: Kohlrabi, nasturtiums, radishes, marigolds, sunflowers, peas, beans, chamomile, beets, carrots, dill, onions, garlic,amaranth (Amaranthus cruentus), celery, Malabar spinach
Avoid: Potato, aromatic herbs
Attracts: Beneficial for ground beetles
Repels: raccoons, ants
Comments: Sow 2 or 3 radish seeds in with cucumbers to repel cucumber beetles. One study showed a 75% reduction in cucumber beetles with the concurrent seeding of amaranth. Various sprays from lettuce, asparagus, Malabar spinach, and celery were found to reduce whiteflies. See cucurbits entry for more info

Cucurbits (melons, cucumbers, gourds, pumpkins, and squash)

Helps: corn
Helped by: corn, grain sorghum
Avoid:
Attracts:
Repels:
Comments:

Eggplant

Helps: Beans, peppers, tomatoes, passion fruit
Helped by: Marigolds, catnip, dill, redroot pigweed, green beans,tarragon, mints, thyme
Avoid:
Attracts:
Repels:
Comments: Marigolds will deter nematodes.

Kohlrabi

Helps: onion, beets, aromatic plants, cucumbers
Helped by: beets, cucumber
Avoid:
Attracts:
Repels:
Comments: See Brassicas entry for more info

Leek

Helps: Carrots, celery, onions, tomato, passion fruit
Helped by: Carrots, clover
Avoid: Swiss chard
Attracts:
Repels:
Comments: See Alliums entry for more info

Lettuce

Helps: Beets, beans, okra, onions, radish, broccoli, Chinese cabbage, carrots, passion fruit
Helped by: Radish, beets, dill, kohlrabi, onions,beans, carrots, cucumbers, strawberries, broccoli thyme, nasturtiums, alyssum, cilantro
Avoid: celery, cabbage, cress, parsley
Attracts: Slugs and snails
Repels: Increased mortality of the diamondback moth on Chinese cabbage
Comments: Mints (including hyssop, sage, and various « balms ») repel slugs, a bane of lettuce and cabbages. Broccoli when intercropped with lettuce was shown to be more profitable then either crop alone

Mustard

Helps: Beans, broccoli, cabbage, cauliflower, fruit trees, grapes, radish, brussels sprouts, turnips
Helped by:
Avoid:
Attracts:
Repels: various pests
Comments: See Brassicas entry for more info. Mustard acts as a trap crop in broccoli

Nightshades (tomatoes, tobacco, chili peppers, potatoes, eggplant, etc

Helps:
Helped by: carrots, alliums, mints, basil, oregano, etc.
Avoid: beans, black walnuts, corn, fennel, dill, brassicas
Attracts:
Repels:
Comments:

Okra

Helps: Sweet potato, tomatoes, peppers
Helped by: beans, lettuce, squash, sweet potato, peppers
Avoid:
Attracts:
Repels:
Comments: Okra and Sweet Potato are mutually beneficial when planted simultaneously

Onion

Helps: Beets, beans, brassicas, cabbage, broccoli, carrots, lettuce, cucumbers, peppers, passion fruit, strawberries. Green onions with Chinese cabbage
Helped by: Carrots, beets, brassicas, dill, lettuce, strawberries, marigolds, mints, tomatoes, summer savory, chamomile, pansy
Avoid: lentils, peas
Attracts:
Repels:
Comments: See Alliums entry for more info

Parsnip

Helps: fruit trees
Helped by:
Avoid:
Attracts: a variety of predatory insects
Repels:
Comments: The flowers of the parsnip plant left to seed will attract a variety of predatory insects to the garden, they are particularly helpful when left under fruit trees, the predators attacking codling moth and light brown apple moth. The root also contains Myristricin, which is toxic to fruit flies, house flies, red spider mite, pea aphids, a simple blender made extraction of three blended parsnips roots to one litre of water through a food processor (not one for preparing food) and left overnight, strained and use within a few days.

Peas

Helps: Brassicas, turnip, cauliflower, garlic
Helped by: Turnip, cauliflower, garlic, mints
Avoid:
Attracts:
Repels: Colorado potato beetle
Comments: Peas when intercropped with turnips, cauliflower, or garlic showed mutual suppression of growth however their profit per land area used was increased

Peppers

Helps: okra
Helped by: Beans, tomatoes, marjoram, okra, geraniums, petunias, sunflowers, onions, crimson clover, basil, field mustard
Avoid: beans, kale (cabbage, Brussels sprouts, etc
Attracts:
Repels:
Comments: Pepper plants like high humidity, which can be helped along by planting with some kind of dense-leaf or ground-cover companion, like marjoram and basil; they also need direct sunlight, but their fruit can be harmed by it…pepper plants grown together, or with tomatoes, can shelter the fruit from sunlight, and raises the humidity level. Sunflowers, when in bloom at the right time, sheltered beneficial insects which lowered thrips populations

Potato

Helps: Brassicas, beans, corn, peas, passion fruit
Helped by: Horseradish, beans, dead nettle, marigolds, peas, onion, garlic, thyme, clover
Avoid: Atriplex, carrot, cucumber, pumpkin, raspberries, squash, sunflower, tomato
Attracts:
Repels: Mexican bean beetle
Comments: Horseradish increases the disease resistance of potatoes. It repels the potato bug. Garlic was shown to be more effective than fungicides on late potato blight. Peas were shown to reduce the density of Colorado potato beetles

Pumpkin

Helps: corn
Helped by: Buckwheat, jimson weed, catnip, oregano, tansy, radishes, nasturtiums
Avoid: potatoes
Attracts: Spiders, Ground Beetles
Repels: flea beetles, cucumber beetles
Comments: Radishes can be used as a trap crop against flea beetles, Cucurbita can be used in the three sisters technique. Nasturtiums repel squash bugs

Radish

Helps: Squash, eggplant, cucumber, lettuce, peas, beans, pole beans
Helped by: Chervil, lettuce, nasturtiums
Avoid: grapes
Attracts:
Repels: flea beetles, cucumber beetles
Comments: Radishes can be used as a trap crop against flea beetles. Radishes grown with lettuce taste better

Soybean

Helps:
Helped by: Corn, snap beans, sunflower
Avoid:
Attracts:
Repels:
Comments: A mixture of corn, mungbean, and sunflower was found to rid soybeans of aphids. Snap beans act as a trap crop for Mexican bean beetles in soybeans

Spinach

Helps: Brassicas, cauliflower, passion fruit
Helped by: Strawberries, peas, beans, cauliflower
Avoid:
Attracts:
Repels:
Comments: The peas and beans provide natural shade for the spinach. See cauliflower notes regarding mutualism with spinach

Squash

Helps: corn, beans, okra
Helped by: Beans, buckwheat, borage, catnip, tansy, radishes,marigolds, nasturtiums
Avoid:
Attracts: Spiders, Ground Beetles
Repels:
Comments: Radishes can be used as a trap crop against flea beetles, Cucurbita can be used in the three sisters technique. Marigolds and nasturtiums repel squash bugs. Marigolds repel cucumber beetles

Sweet potato

Helps: Okra
Helped by: Okra
Avoid:
Attracts:
Repels:
Comments: Okra and Sweet Potato are mutually beneficial when planted simultaneously

Tomatoes

Helps: Brassicas, broccoli, cabbage, celery, roses, peppers, asparagus
Helped by: Asparagus, basil, beans, bee balm (Monarda), oregano, parsley, marigold, alliums, garlic, leeks, celery, geraniums, petunias, nasturtium, borage, coriander, chives, corn, dill, mustard, fenugreek, barley, carrots, eggplant, mints, okra, sage, thyme, « flower strips »
Avoid:  Black walnut, alfalfa, corn, fennel, chili peppers, peas, dill, potatoes, beetroot, brassicas, rosemary
Attracts:
Repels: asparagus beetle
Comments: Black walnuts inhibit tomato growth, in fact they are negative allelopathic to all other nightshade plants (chili pepper, potato, tobacco, petunia) as well, because it produces a chemical called juglone. Dill attracts tomato hornworm.
Growing tomatoes with Basil does not appear to enhance tomato flavour but studies have shown that growing them around 10 inches apart can increase the yield of tomatoes by about 20%. One study shows that growing chili peppers near tomatoes in greenhouses increases tomato whitefly on the tomatoes

Turnips and rutabagas

Helps: peas, broccoli
Helped by: hairy vetch, peas
Avoid:  hedge mustard, knotweed
Attracts:
Repels:
Comments: Turnips act as a trap crop for broccoli. See peas regarding their mutualism with turnips

Apple

Helps:
Helped by: Clover, chives, garlic, leeks, nasturtium, southernwood, daffodils, comfrey
Avoid: Cedar because of apple-cedar rust. Walnut because its roots produce growth inhibitors that apple trees are sensitive to
Attracts:
Repels:
Comments:

 

Apricot

Helps:
Helped by: Clover, chives, garlic, leeks, nasturtium, southernwood, daffodils, comfrey
Avoid: peppers
Attracts:
Repels:
Comments: A fungus that peppers are prone to can infect apricot trees causing a lot of harm.

Blueberries

Helps:
Helped by: oak trees, pine trees, strawberries, clover, bay laurel, dewberries, yarrow
Avoid: tomatoes
Attracts:
Repels:
Comments: Pine and oak trees create the acidic soil blueberries need. Strawberries and dewberries create healthy ground cover, clover fixes nitrogen for the blueberries’ high needs, yarrow and bay laurel repel unhealthy insects. Each of the herbal companions listed also like the acidic soil the blueberry plant needs.

Fruit Trees

Helps:
Helped by: alliums, tansy, nasturtiums, marigolds, marjoram, lemon balm, mustards, dandelions, borag
Avoid:
Attracts:
Repels:
Comments:

Grapes

Helps:
Helped by: Hyssop, alyssum, basil, beans, chives, geraniums, mustards, oregano, clover, peas, blackberries
Avoid: cabbage, garlic, radishes
Attracts:
Repels:
Comments:

Melon

Helps:
Helped by: Chamomile, pigweed, summer savoury, sow thistl
Avoid:
Attracts:
Repels:
Comments:

 

Passion fruit

Helps:
Helped by: Potatoes, beets, Swiss chard, carrots, spinach, strawberries, eggplants, onions, leeks, lettuce
Avoid: Cucurbits, maize, cowpea, sorghum, okra, sweet potatoes
Attracts:
Repels:
Comments:

Pears

Helps:
Helped by: Aromatic plants
Avoid:
Attracts:
Repels:
Comments:

Strawberries

Helps: bush beans, lettuce, onions, spinach, passion fruit
Helped by: caraway, bush beans, lupin, onions, sage, thyme, borage
Avoid: brassicas, tomatoes, potatoes, eggplant, peppers, melons, okra, mint, bush or bramble fruits, stone fruits, chrysanthemums, roses
Attracts: Slugs and snails
Repels:
Comments: Thyme planted and/or placed next to each other help grow more strawberries quickly.

Anise

Helps:
Helped by: Coriander
Avoid:
Attracts:
Repels:
Comments: Not to be confused with star anise which is an entirely different species.

Basil

Helps: tomato, peppers, oregano, asparagus, petunias, grapes
Helped by: chamomile, anise
Avoid: common rue
Attracts: Slugs and snails. butterflies
Repels: asparagus beetle, hornworms, mosquitoes, thrips and flies
Comments: is said to make tomatoes taste better, chamomile and anise are supposed to increase the essential oils in many herbs like basil

Borage

Helps: Almost everything, especially beans, strawberry, cucurbits (cucumber, squash), fruit trees, tomatoes and cabbage
Helped by:
Avoid:
Attracts: Predatory insects, honeybees
Repels: many pests, tomato worm
Comments: Predict a square metre for its adult size. Borage is a good companion for a wide variety of plants

Caraway

Helps: Strawberries
Helped by:
Avoid: Dill
Attracts: Predatory insects, honeybees
Repels:
Comments:

Catnip

Helps: Eggplant
Helped by:
Avoid:
Attracts: Parasitic wasps, parasitic flies
Repels: Flea beetles, ants, aphids
Comments:

Chamomile

Helps: Most herbs, brassicas, cucumber, wheat, onion, cabbage
Helped by:
Avoid:
Attracts: Hoverflies, wasps
Repels:
Comments: Growing near herbs will increase their oil production

Chervil

Helps: Radish, lettuce, broccoli
Helped by:
Avoid: radish
Attracts:
Repels: aphids
Comments: loves shade, fortunately it grows well with shade-tolerant food plants; will make radishes grown near it taste spicier

Chives

Helps: Apples, carrots, grapes, roses, tomatoes, brassica (broccoli, cabbage, mustard, etc.), many others
Helped by: carrots
Avoid: beans, peas
Attracts:
Repels: cabbage worms, carrot fly, aphids, mites, nematodes
Comments: Same companion traits as all alliums (onions, garlic, shallots, leeks, etc.)said to prevent apple scab after 3 years planting at base of apple trees

Cilantro / Coriander

Helps: Anise cabbage, spinach, lettuce, tomato
Helped by: beans, peas
Avoid: dill
Attracts: tachinid fly, hoverflies
Repels: aphids, spider mites, white flies and potato beetle
Comments: Attracts hoverflies which may in turn reduce pest populations in cabbages. Will cross-pollinate easily with dill and ruin both plants.

Dill

Helps: Brassicas, broccoli, cabbage, corn, eggplant/aubergine, fennel, lettuce, onions, cucumbers
Helped by: fennel
Avoid: carrots, tomatoes, cilantro
Attracts: Tiger Swallowtail butterflies/caterpillars, Hoverflies, Wasps, Ladybugs, Tomato Hornworm, honeybees, Ichneumonid Wasps
Repels: Aphids, spider mites, squash bugs, cabbage looper
Comments: One of the few plants said to grow with fennel. See fennel for info about intercropping. Will cross-pollinate easily with cilantro and ruin both

Fennel

Helps: Dill
Helped by: Dill
Avoid: Almost everything
Attracts: ladybugs, syrphid fly, tachinid fly
Repels: aphids
Comments: Fennel is allelopathic to most garden plants, inhibiting growth, causing to bolt, or actually killing many plants. When growing together a higher ratio of fennel to dill provides the highest profit. Dill has a stabilizing effect on the fennel seed. Because it attracts syrphidae it reduces aphids through predation

Flax

Helps: carrots and potatoes
Helped by:
Avoid: Almost everything
Attracts:
Repels: Colorado potato beetle
Comments: Flax contains tannin and linseed oils which may offend the Colorado potato bug

Garlic

Helps: vetch, brassicas, beets, roses, tomatoes, cucumbers, lettuce, celery, peas, Chinese cabbage, potatoes
Helped by: tarragon, peas
Avoid: cabbages, grapes
Attracts:
Repels: Aphids, Japanese beetles, mites, cabbage looper, ants, cabbage maggot, fruit borers, red spider mites, diamondback moth on Chinese cabbage, slugs
Comments: See Alliums entry for more info. Peas and garlic when planted closely together suppress each other’s growth; however the profit over land area used is higher. Tarragon makes garlic grow rapidly.

Hyssop

Helps: brassicas, cabbage, grapes
Helped by:
Avoid: Radishes
Attracts: honeybees, butterflies
Repels: Cabbage moth larvae, Cabbage Butterflies
Comments: Stimulates growth of grapes

Lavender

Helps: Chamomile, lettuce, brassicas, onions, tomatoes, oregano, thyme, marjoram, sage, rosemary, basil, lemon balm, squash
Helped by:
Avoid:
Attracts:
Repels:
Comments:

Lemon Grass

Helps: Eggplant
Helped by:
Avoid:
Attracts:
Repels: Cutworms
Comments:

Lovage

Helps: Beans
Helped by:
Avoid: rhubarb
Attracts: Ichneumonid Wasps, ground beetles (good)
Repels:
Comments: improves the health of almost all plants, like borage and geraniums, is considered a « magic bullet » of companion planting

Parsley

Helps: Asparagus, corn/maize, tomatoes
Helped by: Apple, asparagus, rose
Avoid: Alliums, lettuce
Attracts: Swallowtail Butterflies, wasps, flies
Repels:
Comments: Sacrificially attracts insects that predate upon tomatoes

Oregano

Helps: grapes, tomatoes, peppers, pumpkin,[14] many other plants
Helped by: basil
Avoid:
Attracts: Hoverflies/Syrphidae
Repels: aphids
Comments: Provides ground cover and much-needed humidity for pepper plants if allowed to spread among them. Because it attracts syrphidae, it reduces aphids through predatio

Peppermint

Helps: alliums, brassicas, cabbage, peas, tomatoes
Helped by:
Avoid:
Attracts:
Repels: cabbage root fly, ants, cabbage looper, aphids, onion fly
Comments: Repels cabbage flies, has same general companion properties as other mints

Rosemary

Helps: Cabbage, beans, brassicas, carrots, thyme
Helped by:
Avoid:
Attracts:
Repels: bean beetle
Comments: Deters cabbage flies, repels many bean parasites

Sage

Helps: brassicas, rosemary, cabbage, beans, Brussels sprouts, carrots, strawberry, tomato, marjoram
Helped by:
Avoid:
Attracts: honeybees, cabbage butterfly
Repels: cabbage flies, carrot fly, black flea beetle, cabbage looper, cabbage maggot, repels many bean parasites
Comments: avoid any member of the allium family and common rue

Southernwood

Helps: Brassicas, fruit trees
Helped by:
Avoid:
Attracts:
Repels:
Comments: Controls cabbage moths and malaria mosquitoes.

Spearmint

Helps: alliums, brassicas, cabbage, peas, tomatoes
Helped by:
Avoid:
Attracts:
Repels: ants, aphids, onion fly, cabbage root fly
Comments: Controls ants and aphids, has same general companion properties as other mints.

Stinging nettle

Helps: Chamomille, mint, broccoli, tomatoes, valerian, angelica archangelica, marjoram, sage & peppermint
Helped by:
Avoid:
Attracts:
Repels: aphids
Comments:

Summer Savoury

Helps: beans, melon, onions
Helped by:
Avoid:
Attracts:
Repels:
Comments: also delays germination of certain foul herbs

Tarragon

Helps: Most vegetables, but especially eggplant
Helped by:
Avoid:
Attracts:
Repels:
Comments: Its scent is disliked by most pests, and this plant is also thought to have Nurse Plant properties, enhancing the growth and flavor of crops grown with it.

Thyme

Helps: Brassicas, cabbage, eggplant, potato, strawberry, tomato, Brussels sprouts
Helped by:
Avoid:
Attracts: Hoverflies/Syrphidae
Repels: Cabbage worm, cabbage weevil, cabbage looper, aphids, whitefly
Comments: Because it attracts syrphidae it reduces aphids through predation.

Wormwood

Helps: Brassicas
Helped by: carrots
Avoid:
Attracts:
Repels: Ants
Comments: Wormwood should be used with caution around most vegetables since it does contain toxins

Yarrow

Helps: many plants, Most aromatic plants.
Helped by:
Avoid:
Attracts: predatory wasps, ladybugs, hoverflies, damselbugs
Repels: aphids
Comments: May increase the essential oil production of some herbs. Also improves soil quality, use the leaves to enrich compost, or as mulch. Because it attracts syrphidae it reduces aphids through predation

Alyssum

Helps: Grapes, lettuce
Helped by:
Avoid:
Attracts: Syrphidae and most beneficial insects
Repels: aphid
Comments: Because they attract syrphidae they help reduce aphids through predation

Baby’s breath

Helps:
Helped by:
Avoid:
Attracts: Syrphidae aphids
Repels:
Comments: Because they attract syrphidae they help reduce aphids through predation

Bee Balm

Helps:
Helped by:
Avoid:
Attracts: Bees
Repels:
Comments:

Californian Poppy

Helps:
Helped by:
Avoid:
Attracts: Syrphidae aphids
Repels:
Comments: Because they attract syrphidae they help reduce aphids through predation

Dianthus

Helps: Roses, lavender, Echinacea, aster, foxglove
Helped by:
Avoid:
Attracts:
Repels: slugs
Comments:

Geraniums

Helps: Roses, corn, peppers, grapes
Helped by:
Avoid: Tomatoes, Tobacco, Eggplants and other nightshades
Attracts:
Repels: leafhoppers, Japanese beetles
Comments: A trap crop, attracting pests away from roses and grape vines, distracts beet leafhoppers, carrier of the curly top virus, keep away from Solanaceous plants like eggplant, and tobacco

Larkspur

Helps: Beans, cabbage
Helped by:
Avoid:
Attracts:
Repels:
Comments:

Lupin

Helps: Cucurbits, brassica, lettuce, rosemary, dill, strawberry, rose
Helped by: summer savory, rose
Avoid: tomatoes and other solanaceae
Attracts: Honeybees
Repels:
Comments: This wildflower is a legume, hosting bacteria that fixes nitrogen in the soil, fertilizing it for neighboring plants. Same with marigold, planting nearby roses causes them to grow vigorously

Marigold

Helps: most plants, especially tomatoes[14] and peppers, cucurbits (cucumbers, gourds, squash, potatoes,[14] roses,[14] alliums,[10][11] brassicas,[10][11][31] zucchini
Helped by: rose
Avoid:
Attracts: Snails and slugs
Repels: Root-knot nematodes, beet leaf hoppers, cucumber beetle,squash bug, onion fly, cabbage root fly
Comments: Marigolds are a wonder-drug of the companion plant world. French marigolds (T. patula) produce a pesticidal chemical from their roots, so strong it lasts years after they are gone. Mexican marigolds (T. erecta) do the same, but are so strong they will inhibit the growth of some more tender herbs. Stinking Roger (T. minuta) has also been found effective against certain perennial weeds. Same with lupin, planting nearby roses causes them to grow vigorously

Nasturtium

Helps: beans, squash, tomatoes, fruit trees, brassicas,radish, cucumbers
Helped by:
Avoid: cauliflower
Attracts: predatory insects
Repels: aphids, asparagus beetle, cabbage looper, cabbage worm, carrot fly, cabbage weevil, Colorado potato beetle, squash bug, Japanese beetle, Mexican bean beetle, striped pumpkin beetles, whitefly,cucumber beetles, flea beetle
Comments: trap crops for aphids, is among the best at attracting predatory insects, deters many pests of cucurbits

Pansy

Helps: wittrockiana alliums, onions, roses
Helped by: roses
Avoid:
Attracts: bees, butterflies, ants
Repels: Ants (with aphids), snails, slugs, white butterfly
Comments: A good and nice-smelling flower that really attracts ants. It is like the Viola plant, but has two or three colors in flowers. Helps alliums and onions, which repels the white butterfly.

Petunia

Helps: cucurbits (squash, pumpkins, cucumbers), asparagus
Helped by:
Avoid:
Attracts:
Repels: leafhoppers, Japanese beetles, aphids, asparagus beetle
Comments: Is a trap crop almost identical to geraniums in function

Phacelia

Helps: plants which are prone to aphids, especially lettuce, tomato, rose
Helped by:
Avoid:
Attracts: hoverfly
Repels:
Comments: This plant attracts hoverflies and is good around plants which are prone to aphids

Rose

Helps:
Helped by: Chives, garlic, marigolds
Avoid:
Attracts:
Repels:
Comments:

Sunflower

Helps: annuus Peppers, corn, cucumber, soybeans, tomatoes, swan plant
Helped by: swan plant
Avoid: pole beans
Attracts: aphids
Repels:
Comments: Was grown as a companion for corn(maize); ants herd aphids onto sunflowers, keeping them off neighboring plants. Works as a trap plant for thrips keeping them off of bell peppers. Planting near swan plants help sunflowers grow rapidly

Swan plant

Helps: Sunflower
Helped by: Sunflower, basil
Avoid: plants that attracts aphids and spider mites
Attracts: monarch butterfly
Repels: aphids
Comments: Attracts the Monarch butterfly during Spring and Summer. Basil repels pests that attracts by the swan plant like aphids.

Sweet pea

Helps:
Helped by: brassica, spinach, silverbeet and salads
Avoid:
Attracts: bees
Repels: aphids
Comments: An annual climbing plant, which is like the edible pea. Makes a good decoration in your garden or fence

Tansy

Helps: beans, brassicas, cucurbits (cucumbers, squash, etc.), raspberries and relatives, roses, corn, fruit trees
Helped by:
Avoid:
Attracts: ladybugs, honeybees
Repels: flying insects(Ichneumonid wasps), ants, Japanese beetles,cabbage butterfly, cabbage maggot, asparagus beetle, carrot fly, striped cucumber beetles, Colorado potato beetle, cutworm, flea beetle, flies, imported cabbageworm, squash bugs, mice
Comments: Toxic to people and many animals, don’t plant it where livestock browse. Is reputed to generally repel insects (except for nectar-eating types)

Zinnia

Helps: beans, tomatoes, peppers
Helped by:
Avoid:
Attracts:
Repels: whiteflies
Comments: Attracts hummingbirds that eat whitflies, attracts pollinators

Alfalfa

Helps: Cotton
Helped by:
Avoid: Tomatoes, fava beans
Attracts: assassin bug, big-eyed bug, Ladybug, parasitic wasps
Repels: Lygus bugs
Comments: Used by farmers to reduce cotton pests, a good crop to improve soil; fixes nitrogen like beans do. Also breaks up hardpan and other tough soil. Alfalfa has demonstrated some allelopathic effects to tomato seedlings

Peanut

Helps: Beans, Corn, Cucumber, Eggplant, Lettuce, Marigold, Melon and Sunflower
Helped by:
Avoid:
Attracts:
Repels:
Comments: Peanuts encourage growth of corn and squash

Walnut Tree

Helps:
Helped by: European Alder (sacrifice plant), hairy vetch,crownvetch, sericea lespedeza
Avoid: apple trees, grasses
Attracts:
Repels:
Comments: Black walnut is harmful to the growth of all nightshade plants, including Datura or Jimson weed, eggplant, mandrake, deadly nightshade or belladonna, capsicum (paprika, chile pepper), potato, tomato, and petunia.