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Vegetables
Common name scientific name Helps Helped by Attracts Repels / Distracts Avoid Comments
Alliums Allium fruit trees, nightshades (tomatoes, peppers, potatoes, etc), brassicas (cabbage, broccoli, kohlrabi, etc) carrots carrots slugs, aphids, carrot fly, cabbage worms beans, peas, parsley Alliums include onions, garlic, leeks, shallots, chives, and others
Asparagus Asparagus officinalis Tomatoes Aster Family flowers, Dill ,Coriander, Tomatoes, Parsley, Basil, Comfrey, Marigolds Onion, Garlic, Potatoes Marigolds will deter beetles.
Brassicas Brassica geraniums, dill, alliums (onions, shallots, garlic, etc), rosemary, nasturtium, borage mustards, nightshades (tomatoes, peppers, etc) Brassicas are a family of species which include broccoli, cabbage, brussels sprouts, kholrabi, and cauliflower.
Beans, Phaseolus Corn (see Three Sisters), Spinach, lettuce, rosemary, summer savory, dill, carrots, brassicas, beets, radish, strawberry and cucumbers Eggplant, Summer savory California beetles Tomatoes, chili peppers, sunflowers, alliums (onions, garlic, etc), kales (cabbage, broccoli, etc) Hosts nitrogen-fixing bacteria, a good fertilizer for some plants, too much for others
Beets, Beta Vulgaris lettuce, kohlrabi, onions and brassicas Catnip, Garlic, Mint Runner or pole beans Good for adding minerals to the soil through composting leafs which have up to 25% magnesium. Runner or pole beans and beets stunt each other's growth.
Broccoli Brassica oleracea geraniums, dill, alliums, rosemary, nasturtium, borage mustards, Tomatoes, peppers Rosemary repels cabbage fly, geraniums trap cabbage worms, same general companion profile as all brassica (cabbage, kolhrabi, brussels sprouts, cauliflower, etc)
Cabbage Brassica oleracea geraniums, dill, alliums, rosemary mustards, Tomatoes, peppers strawberries, and pole/runner beans Rosemary repels cabbage flies, geraniums trap cabbage worms, same general companion profile as all brassica (cabbage, kolhrabi, brussels sprouts, cauliflower, etc)
Carrots Daucus carota Tomatoes, Alliums (onions, chives, etc), lettuce alliums (leeks, shallots, etc), rosemary, wormwood, sage, beans, flax assassin bug, lacewing, parasitic wasp, yellow jacket and other predatory wasps Dill, parsnip, radish Tomatoes grow better with carrots, but may stunt the carrots' growth. Beans (which are bad for tomatoes) 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 interplanted 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.
Celery, Apium graveolens Cosmos, Daisies, Snapdragons corn, Aster flowers, these can transmit the aster yellows disease
Corn / Maize Zea mays beans Sunflowers, legumes (beans, peas, soybeans etc), peanuts, curcubits (squash, cucumbers, melons, etc), amaranth, white geranium, lamb's quarters, morning glory, parsley, and potato Tomato, Celery provides beans with a trellis, is protected from predators and dryness by cucurbits, in the three sisters technique
Cucumber Cucumis Sativus Nasturtiums, radishes, marigolds, sunflowers peas, beets, carrots, and Dill Beneficial for ground beetles Tomato, Sage
Common name scientific name Helps Helped by Attracts Repels / Distracts Avoid Comments
Eggplant Solanum melongena Beans, Peppers Marigolds, tarragon, mints Runner beans Marigolds will deter nematodes.
Leek Allium ampeloprasum v. porrum Celery, apple trees carrots cabbage worms, aphids, carrot fly, others Legumes (beans, peas, etc) Same companion traits as all alliums (onions, garlic, shallots, chives, etc)
Lettuce Lactuca sativa Radish, Kohlrabi, beans, carrots celery, cabbage, cress, parsley Mints (including hyssop, sage, and various "balms") repel slugs, a bane of lettuce and cabbages
Mustard Brassicaceae, Sinapis alba Cabbage, cauliflower, radish, brussels sprouts, turnips various pests same general companion profile as all brassica (cabbage, kolhrabi, brussels sprouts, cauliflower, etc)
Nightshades Solanaceae carrots, alliums, mints (basil, oregano, etc) beans, black walnuts, corn, fennel, dill, brassica (broccoli, cabbage, cauliflower, etc) Nightshade plants include tomatoes, tobacco, chili peppers (including bell peppers), potatoes, eggplant, and others
Peppers Solanaceae, Capsicum themselves, marjoram tomatoes, geraniums, petunias beans, kale (cabbage, brussels sprouts, etc) Pepper plants like high humidity, which can be helped along by planting with some kind of dense-leaf or ground-cover companion, like majoram 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.
Onion Allium cepa Tomatoes, Kales (broccoli, cabbage, etc) Carrots aphids, carrot fly, other pests beans, peas, parsley Same companion traits as all other alliums (chives, garlic, shallots, leeks, etc)
Potato Solanum tuberosum Horseradish Sunflower, Tomato, Cucumber horseradish increases the disease resistance of potatoes
Pumpkin Squash Curcurbita spp corn, beans Buckwheat, catnip, tansy, radishes Spiders, Ground Beetles Flea Beetles are warded off by radishes, Curcurbita can be used in the three sisters technique
Spinach Spinacia oleracea Peas, Beans The peas and beans provide natural shade for the spinach
Tomatoes Solanum lycopersicum roses, peppers, asparagus basil, oregano, parsley, carrots, marigold, Alliums, celery, Geraniums, Petunias, Nasturtium, Borage asparagus beetle Black walnut, corn, fennel, peas, dill, potatoes, beetroot, kales (kohlrabi, cabbage, etc), rosemary Black walnuts inhibit tomato growth, in fact they are allelopathic to all other nightshade plants (chili pepper, potato, tobacco, petunia) as well, because it produces a chemical called juglone.

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Herbs
Common name scientific name Helps Helped by Attracts Repels / Distracts Avoid Comments
Basil Ocimum basilicum tomato, peppers, oregano, asparagus, petunias chamomile, anise butterflies asparagus beetle, mosquitoes and flies common rue, sage is said to make tomatoes taste better, chamomile and anise are supposed to increase the essential oils in many herbs like basil
Borage Borago officinalis Almost everything, especially strawberry, cucurbits (cucumber, gourds), tomatoes Predatory insects, honeybees many pests Borage is the magic bullet of companion plants
Caraway Carum carvi Strawberries Parasitic wasps, parasitic flies
Chamomile Matricaria recutita Basil, Wheat, Onion, Cabbage, Cucumber Hoverflies, wasps Growing near herbs will increase their oil production.
Chervil Anthriscus cerefolium Radish, lettuce, broccoli aphids loves shade, fortunately it grows well with shade-tolerant food plants; will make radishes grown near it taste spicier
Cilantro / Coriander Coriandrum sativum spinach beans, peas tachinid fly aphids
chives Allium schoenoprasum Apples, carrots, tomatoes, brassica (broccoli, cabbage, mustard, etc), many others carrots cabbage worms, carrot fly, aphids beans, peas 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
Dill Anethum graveolens Cabbages, Corn, Lettuce, Onions, Cucumbers Hoverflies, Wasps, Tomato Horn Worms, honeybees, Ichneumonid Wasps Aphids, spider mites, squash bugs, cabbage looper carrots, tomatoes one of the few plants said to grow with fennel
Fennel Foeniculum vulgare Dill Dill ladybugs, syrphid fly, tachinid fly aphids Almost everything Fennel is allelopathic to most garden plants, inhibiting growth, causing to bolt, or actually killing many plants
Garlic Allium sativum Apple trees, Pear trees, Roses, Cucumbers, Peas, Lettuce, Celery Aphids, cabbage looper, ants, rabbits, cabbage maggot Deters rabbits, same companion traits as all alliums (onions, chives, shallots, leeks, etc)
Hemp Cannabis sativa L. subsp. sativa Brassica (cabbage, brussels sprouts, other kales) Repels many types of beetles which attack cabbages.
Hyssop Hyssopus officinalis Cabbage, grapes honeybees, butterflies Cabbage moth larvae, Cabbage Butterflies Stimulates growth of grapes.
Lovage Levisticum officinale Almost all plants beans Ichneumonid Wasps, ground beetles (good) rhubarb Is thought to improve the health of almost all plants, like borage and geraniums, is considered a "magic bullet" of companion planting
Oregano Origanum vulgare Tomatoes, peppers, many other plants basil aphids provides ground cover and much-needed humidity for pepper plants if allowed to spread among them
Peppermint Mentha piperita Brassica (cabbage, kholrabi, broccoli, and the other kales) cabbage fly, ants, cabbage looper Repels cabbage flies, has same general companion properties as other mints
Rosemary Rosmarinus officinalis sage, cabbage, beans, carrots bean beetle Deters cabbage flies, repels many bean parasites
Sage Salvia officinalis rosemary, cabbage, beans, carrots honeybees, cabbage butterfly cabbage flies, carrot fly, black flea beetle, cabbage looper, cabbage maggot Deters cabbage flies, repels many bean parasites
Southernwood Artemisia abrotanum Fruit trees Controls cabbage moths and malaria mosquitoes.
Spearmint Mentha spicata ants, aphids Controls ants and aphids, has same general companion properties as other mints.
Summer Savoury Satureja hortensis Green beans, onions, also delays germination of certain foul herbs
Tansy Tanacetum vulgare beans, cucurbits (cucumbers, squash, etc), corn, roses honeybees flying insects(Ichneumonid Wasps), Japanese beetles, striped cucumber beetles, squash bugs and ants Is reputed to generally repel insects (except for nectar-eating types). This herb should not be consumed, as it is quite toxic.

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Flowers
Common Name Latin Name Helps Helped by Attracts Repels / Distracts Avoid Comments
Geraniums Pelargonium spp. Roses, tomatoes, peppers, grapes leafhoppers, Japanese beetles A trap crop, attracting pests away from roses and grape vines, distracts beet leafhoppers, carrier of the curly top virus, away from Solanaceous plants like tomatoes, peppers, eggplant, and tobacco
Marigold Asteraceae Calendula officinalis most plants, especially tomatoes and peppers, cucurbits (cucumbers, gourds, squash), brassicas (broccoli, kale, cabbage) nematodes, beet leaf hoppers, other pests Marigolds are a wonder-drug of the companion plant world, invoking the saying "plant them everywhere in your garden". French marigolds produce a pesticidal chemical from their roots, so strong it lasts years after they are gone. Mexican marigolds do the same, but are so strong they will inhibit the growth of some more tender herbs. Certain Varieties of marigolds (Tagetes) can help manage eelworms (Root-knot nematode) when planted the year before[1].
Petunia Petunia x hybrida cucurbits (squash, pumpkins, cucumbers), asparagus leafhoppers, Japanese beetles, aphids, asparagus beetle Is a trap crop almost identical to geraniums in function
Nasturtium Tropaeolum majus Many plants, especially cucurbits (melons, cucumbers, gourds), beans, tomatoes, apple trees, brassicas (broccoli, cabbage, etc), radish predatory insects aphids, cabbage looper, squash bug, white fly, cucumber beetles radish, cauliflower Both work as trap crops for aphids, is among the best at attracting predatory insects
Sunflower Helianthus annuus corn, tomatoes aphids Was grown as a companion for corn(maize) before modern Europeans arrived in the Americas, supposedly increases their production, ants herd aphids onto sunflowers, keeping them off neighboring plants
Tansy Tanacetum vulgare cucurbits (cucumbers, squash, etc), raspberries and relatives, roses, corn sugar ants, Japanese beetles, cucumber beetles, squash bugs, mice Toxic to many animals, don't plant it where livestock browse
Yarrow Achillea millefolium many plants predatory wasps, ladybugs, hoverflies, damselbugs May increase the essential oil production of some herbs. Also improves soil quality, use the leaves to enrich compost, or as mulch.

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