List of companion plants

Dill is one of the few plants to grow with fennel

This is a list of companion plants. Many more are in the list of beneficial weeds. Companion plants assist in the growth of others by attracting beneficial insects, repelling pests, or providing nutrients, shade, or support. They can be part of a biological pest control program.

Vegetables

Vegetables
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Alliums	Allium	Fruit trees,[1] nightshades (tomatoes,[2] capsicum peppers,[3] potatoes,[4] brassicas,[5] carrots[6][7]	Carrots,[7] tomatoes,[8] carrots and African spider plants (Cleome gynandra) together,[9] marigolds (Tagetes spp.),[10][11] mints[10][11]	Thrips[9]	-rabbits,[5] slugs (see Garlic), -aphids,[6] carrot fly,[7] -cabbage loopers,[6] -cabbage maggots,[6] -cabbage worms,[6] -Japanese beetles[6]	Beans [12] peas,[13]	Alliums are a family of plants which include onions, garlic, leeks, shallots, chives, and others.
Asparagus	Asparagus officinalis	Tomatoes,[14] parsley[15][16]	Aster family flowers, dill, coriander, tomatoes,[15][16] parsley,[15][16] basil,[16] comfrey, marigolds, nasturtiums	Coupled with basil seems to encourage lady bugs		Onion, garlic, potatoes, gladiolus
Beans and other legumes	Phaseolus and Vicia	Beets,[14][17] lettuce,[18] okra,[18] potato,[16][19][20][21] spinach, dill, cabbage,[16] carrots, chards, eggplant,[22] peas, tomatoes,[16] brassicas,[23] corn,[14][16][17] cucumbers,[17][22] grapes	Summer savory,[12][16] beets,[12][17] cucumbers,[12][17] borage,[14] cabbage,[12] carrots,[12] cauliflower,[12] corn,[11][16][17] larkspur,[14] lovage,[14] marigolds,[12][17] mustards,[14] radish,[12][17] potato,[19][20][21] peppermint,[23] rosemary,[14][17][23] lettuce,[18][24] onion,[24] squash,[18] lacy phacelia[25]	Snails and slugs[26]	Colorado potato beetle[12][20]	Tomatoes, chili peppers, alliums,[12][17] gladiolas[12][27]	Hosts nitrogen-fixing bacteria, a good fertiliser for some plants, too much for others. Rosemary and peppermint extracts are used in organic sprays for beans.[23] Summer savory[17] and potatoes[20] repel bean beetles.
Beans, bush	Phaseolus vulgaris	Cucumber,[16] soybeans,[11] strawberries[28]	Celery,[5][16] strawberries,[12][16] grains[23]			Fennel,[12] soybeans,[23] dry beans,[23] alfalfa[23]	"Lettuce, potato, tomato, other legumes, crucifers, or cucurbits increase sclerotinia" in the soil and should be avoided before and after snap beans.[23] See also the entry for "Beans and other legumes" for more info
Beans, pole	Uncertain		Radishes[12]			Sunflowers,[12] beets,[12] brassicas,[14] kohlrabi[27]	See the entry for "Beans and other legumes" for more info
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Beets	Beta vulgaris	Broccoli,[5] bush beans,[12][17] cabbage,[17] lettuce,[17] kohlrabi,[14][29] onions,[14] brassicas,[17][27] passion fruit[30]	Bush beans,[14][17] onions,[14] kohlrabi,[14][29] catnip, garlic,[14] lettuce,[12] most brassicas,[12] mint			Runner or pole beans[14]	Good for adding minerals to the soil through composting leaves which have up to 25% magnesium. Runner or pole beans and beets stunt each other's growth.
Brassicas	Brassica	Beets,[12] onions,[14] potatoes, cereals (e.g. corn, wheat)	Beets,[17][27] spinach,[27] chard,[27] Aromatic plants or plants with many blossoms, such as celery,[11][27] chamomile,[11][14][27] and marigolds.[10][11][31] Dill,[5][11][14] sage,[5][11] peas,[11] peppermint,[5][10][11] spearmint,[11] spurrey,[11] rosemary,[5][11] rye-grass,[11] garlic,[14] onions[27][32] and potatoes.[5] geraniums, alliums,[5] nasturtium,[11][32] borage, hyssop,[5][11] tansy,[11] tomatoes,[11] thyme,[5][11][32] wormwood,[5] southernwood,[5][11] beans,[23] clover[11]		Wireworms	Mustards, nightshades (tomatoes,[14][27] peppers, etc.), pole beans,[14][27] strawberries[14][27]	Brassicas are a family of plants which includes broccoli, Brussels sprouts, cabbage, cauliflower, Chinese cabbage, kohlrabi, radish, and turnip. Thyme, nasturtiums, and onion showed good resistance to cabbage worm, weevil and cabbage looper.[32]
Broccoli	Brassica oleracea	Lettuce[33]	Mixture of mustard, pac choi, and rape.[11] Beets, dill,[5][11] lettuce,[33] mustard,[11] onions,[11][17] tomato,[34] turnip,[35] clover[34]				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.[35] See brassicas entry for more info
Brussels sprouts	Brassica oleracea		Sage,[11][36] thyme,[11][36] clover,[36] malting barley[11]
Cabbage	Brassica oleracea / Brassica chinensis	Beans,[12] celery[5]	Beans,[16] clover,[37][38] calendula/pot marigold,[39] chamomile,[17] larkspur,[14] nasturtiums,[17] dill,[17][40] coriander,[41] hyssop,[14] onions,[14][17][42] beets,[17] marigolds,[11] mint,[11][14][17] rosemary,[17] sage,[14][17] thyme,[17] tomatoes,[11] lacy phacelia,[11] lettuce or garlic with Chinese cabbage.[43] Green onions with Chinese cabbage.[11]	Snails and slugs[26]		Grapes[44]	See brassicas entry for more info. 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.[43] Nasturtiums repel cabbage moths[17]
Carrots	Daucus carota	Tomatoes,[45] alliums,[7] beans,[12] leeks,[13] lettuce,[14][46] onions,[7] passion fruit[30]	Lettuce,[46] alliums (chives,[14] leeks,[14] onions,[7][14][15] shallots, etc.), rosemary,[14] wormwood,[14] sage,[14] beans, flax	Assassin bug, lacewing, parasitic wasp, yellow jacket and other predatory wasps	Leek moth,[15] onion fly[7][15]	Dill, parsnip, radish	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	Brassica oleracea	Beans,[12] celery,[5] spinach,[47] peas[48]	Mixture of Chinese cabbage, marigolds, rape, and sunflower.[11] Spinach,[47] peas[48]				One row of spinach alternating at 60 cm from each row of cauliflower proved mutually beneficial.[47] See brassicas for more info. See peas regarding their mutualism with cauliflower.
Celery	Apium graveolens	Bush beans,[5][16] brassicas,[5][11][27] cucumber[49]	Cosmos, daisies, snapdragons, leeks,[5] tomatoes,[5] cauliflower,[5] cabbage,[5] bush beans[5]		Whiteflies[49]	Corn, aster flowers	Aster flowers, can transmit the aster yellows disease
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Chard	Beta vulgaris ssp. cicla	Brassicas,[27] passion fruit[30]
Corn / Maize	Zea mays	Beans,[11][16][17] cucurbits,[14] soybeans,[50] tomatoes[51]	Sunflowers, dill,[17] legumes (beans,[14][16][17] peas,[14] soybeans etc.), peanuts, cucurbits,[14] clover,[52] amaranth,[53] white geranium, pigweed,[14] lamb's quarters, morning glory, parsley, and potato,[14] field mustard,[54] Sudan grass[11]			Tomato,[22] celery	Provides beans with a trellis, is protected from predators and dryness by cucurbits, in the three sisters technique
Cucumber	Cucumis sativus	Beans,[12][17] kohlrabi,[29] lettuce[14]	Kohlrabi,[29] nasturtiums,[14] radishes,[22] marigolds, sunflowers,[22] peas,[22] beans,[16][17][22] chamomile,[14] beets, carrots, dill,[17] onions,[55] garlic,[55][56] amaranth (Amaranthus cruentus),[57] celery,[49] Malabar spinach[49]	Beneficial for ground beetles	Raccoons,[14] ants[14]	Potato,[14] aromatic herbs[14]	Sow 2 or 3 radish seeds in with cucumbers to repel cucumber beetles.[14] One study showed a 75% reduction in cucumber beetles with the concurrent seeding of amaranth.[57] Various sprays from lettuce, asparagus, Malabar spinach, and celery were found to reduce whiteflies.[49] See cucurbits entry for more info
Cucurbits	Cucurbitaceae	Corn[14]	Corn,[14] grain sorghum[58]				Cucurbits are a family of plants that includes melons, cucumbers, gourds, pumpkins, and squash
Eggplant or Aubergine	Solanum melongena	Beans, peppers, tomatoes,[59] passion fruit[30]	Marigolds, catnip,[17] dill,[11] redroot pigweed,[22] green beans,[22] tarragon, mints, thyme[14]				Marigolds will deter nematodes.
Kohlrabi	Brassica oleracea v. gongylodes	Onion,[14][29] beets,[29] aromatic plants,[29] cucumbers[29]	Beets,[14][29] cucumbers[29]				See Brassicas entry for more info
Leek	Allium ampeloprasum v. porrum	Carrots,[14] celery,[29] onions,[29] tomato,[60] passion fruit[30]	Carrots[13] clover,[61]			Swiss chard	See Alliums entry for more info
Lettuce	Lactuca sativa	Beets,[12] beans,[18][24] okra,[18] onions,[29] radish,[14] broccoli,[33] Chinese cabbage,[43] carrots,[46] passion fruit[30]	Radish, beets,[17] dill,[14][17] kohlrabi, onions,[14][29][32] beans,[18] carrots,[14][46] cucumbers,[14] strawberries,[14] broccoli[33] thyme,[32] nasturtiums,[32] alyssum,[62] cilantro[62]	Slugs and snails.[26]	Increased mortality of the diamondback moth on Chinese cabbage.[43]	Celery, cabbage, cress, parsley	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.[33]
Mustard	Sinapis alba	Beans,[14] broccoli,[11] cabbage, cauliflower, fruit trees,[14] grapes,[14] radish, brussels sprouts, turnips			Various pests		See Brassicas entry for more info. Mustard acts as a trap crop in broccoli.[11]
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Nightshades	Solanaceae		Carrots, alliums, mints (basil, oregano, etc.)			Beans, black walnuts, corn, fennel, dill, brassicas	Nightshades are a family of plants which include tomatoes, tobacco, chili peppers (including bell peppers), potatoes, eggplant, and others
Okra	Abelmoschus esculentus	Sweet potato,[63] tomatoes,[59] peppers[64]	Beans,[18] lettuce,[18] squash,[18] sweet potato,[63] peppers[64]				Okra and sweet potato are mutually beneficial when planted simultaneously.[63]
Onion	Allium cepa	Beets,[14] beans,[24] brassicas,[27][32] cabbage,[14][17][42] broccoli,[11][17] carrots,[7][14][15] lettuce,[14][29] cucumbers,[55] peppers,[3] passion fruit,[30] strawberries.[14] Green onions with Chinese cabbage.[11]	Carrots,[7] beets,[14] brassicas,[14] dill,[14] lettuce,[14] strawberries,[14] marigolds,[11] mints,[11] tomatoes,[14] summer savory,[14] chamomile,[14][17] pansy			Lentils, peas,[14]	See Alliums entry for more info
Parsnip	Pastinaca sativa	Fruit trees		A variety of predatory insects			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	Pisum sativum	Brassicas,[11] turnip,[48] cauliflower,[48] garlic,[48]	Turnip,[48] cauliflower,[48] garlic,[48] mints[14]		Colorado potato beetle[7]		Peas when intercropped with turnips, cauliflower, or garlic showed mutual suppression of growth however their profit per land area used was increased.[48]
Peppers	Solanaceae, Capsicum	Okra[64]	Beans,[65] tomatoes, marjoram, okra,[64] geraniums, petunias, sunflowers,[66][67] onions[3] crimson clover,[68] basil,[14] field mustard[54]			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 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.[66]
Potato	Solanum tuberosum	Brassicas,[5] beans,[19][20][21] corn,[14] peas,[69] passion fruit[30]	Horseradish,[14][17] beans,[16][19][20][21] dead nettle,[14] marigolds,[14] peas,[7][69] onion,[4] garlic,[4][70] thyme,[14] clover[71]		Mexican bean beetle[20]	Atriplex, carrot, cucumber,[14] pumpkin,[72] raspberries, squash, sunflower, tomato	Horseradish increases the disease resistance of potatoes. It repels the potato bug.[17] Garlic was shown to be more effective than fungicides on late potato blight.[70] Peas were shown to reduce the density of Colorado potato beetles.[7]
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Pumpkin	Cucurbita pepo	Corn,[72] beans	Buckwheat, Jimson weed,[72] catnip, oregano,[14] tansy, radishes, nasturtiums	spiders, ground beetles		Potatoes[72]	Radishes can be used as a trap crop against flea beetles, cucurbita can be used in the three sisters technique. Nasturtiums repel squash bugs.[14]
Radish	Raphanus sativus	Squash[14] eggplant, cucumber,[14] lettuce,[17] peas,[17] beans,[12][17] pole beans,[12]	Chervil,[14][17] lettuce,[14] nasturtiums[14][17]		flea beetles, cucumber beetles[17]	Grapes	Radishes can be used as a trap crop against flea beetles. Radishes grown with lettuce taste better.[14]
Soybean	Glycine max		Corn,[50] snap beans,[11] sunflower[50]				A mixture of corn, mungbean, and sunflower was found to rid soybeans of aphids.[50] Snap beans act as a trap crop for Mexican bean beetles in soybeans.[11]
Spinach	Spinacia oleracea	Brassicas,[27] cauliflower,[47] passion fruit[30]	Strawberries,[73] peas, beans, cauliflower[47]				The peas and beans provide natural shade for the spinach. See cauliflower notes regarding mutualism with spinach.[47]
Squash	Cucurbita spp.	corn, beans,[18] okra,[18]	Beans,[18] buckwheat, borage,[14][17] catnip, tansy, radishes,[14] marigolds,[32] nasturtiums[14][20]	Spiders, ground beetles			Radishes can be used as a trap crop against flea beetles, cucurbita can be used in the three sisters technique. Marigolds[32] and nasturtiums repel squash bugs.[14][20] Marigolds repel cucumber beetles.[32]
Sweet potato	Ipomoea batatas	Okra[63]	Okra[63]				Okra and sweet potato are mutually beneficial when planted simultaneously.[63]
Tomatoes	Solanum lycopersicum	Brassicas,[11] broccoli,[34] cabbage,[11] celery,[5] roses,[14] peppers, asparagus[73]	Asparagus,[15] basil,[11][17][32][60][74] beans,[16] bee balm (Monarda),[12][14] oregano, parsley, marigold,[14] alliums, garlic,[2][14] leeks,[60] celery, geraniums, petunias, nasturtium, borage,[14][17] coriander,[45][75] chives,[14] corn,[51] dill,[45] mustard,[45] fenugreek,[45] barley,[45] carrots,[45] eggplant,[59] mints,[14] okra,[59] sage,[14] thyme,[14][32] "flower strips"[76]		Asparagus beetle[73]	Black walnut,[14] alfalfa,[77] corn,[22] fennel,[14] chili peppers,[59] peas,[51] dill, potatoes,[14] beetroot, brassicas,[14] rosemary	Black walnuts inhibit tomato growth,[14] 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%.[74] One study shows that growing chili peppers near tomatoes in greenhouses increases tomato whitefly on the tomatoes.[59]
Turnips and rutabagas	Brassica rapa and Brassica napobrassica	Peas,[48][73] broccoli[35]	Hairy vetch,[73] peas[48][73]			hedge mustard,[73] knotweed[73]	Turnips act as a trap crop for broccoli.[35] See peas regarding their mutualism with turnips.

Fruit

Fruit
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Apple	Malus domestica		Clover, chives, garlic, leeks, nasturtium, southernwood, daffodils, comfrey			Cedar because of apple-cedar rust. Walnut because its roots produce growth inhibitors that apple trees are sensitive to[78]
Apricot	Prunus armeniaca					Peppers	A fungus that peppers are prone to can infect apricot trees causing a lot of harm.
Blueberries	Vaccinium spp.		Oak trees,[79] pine trees,[79] strawberries, clover, bay laurel, dewberries, yarrow			tomatoes	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	Various		Alliums,[1] tansy,[1] nasturtiums,[1] marigolds,[1] marjoram,[1] lemon balm,[1] mustards,[14] dandelions,[14] borage[1]
Grapes	Vitis spp.		Hyssop,[14][17] alyssum,[11] basil, beans, chives,[14] geraniums, mustards,[14] oregano, clover, peas, blackberries			Cabbage,[44] garlic,[44] radishes
Melon	Cucumis melo		Chamomile,[14] pigweed,[14] summer savoury,[14] sow thistle[14]
Passion fruit	Passiflora edulis		Potatoes,[30] beets,[30] Swiss chard,[30] carrots,[30] spinach,[30] strawberries,[30] eggplants,[30] onions,[30] leeks,[30] lettuce[30]			Cucurbits,[30] maize,[30] cowpea,[30] sorghum,[30] okra,[30] sweet potatoes[30]
Pears	Pyrus spp.		"Aromatic plants"[80]
Strawberries	Fragaria × ananassa	Bush beans,[12] lettuce,[14] onions,[14] spinach,[73] passion fruit[30]	Caraway,[28] bush beans,[28] lupin,[28] onions,[14] sage,[14] thyme,[14] borage[14][17][28]	Slugs and snails.[26]		Brassicas,[28] Verticillium-susceptible species (tomatoes, potatoes, eggplant, peppers, melons, okra, mint, bush or bramble fruits, stone fruits, chrysanthemums, roses)[28]	Thyme planted and/or placed next to each other help grow more strawberries quickly.

Herbs

Herbs
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Anise	Pimpinella anisum		Coriander[14]				Not to be confused with star anise which is an entirely different species.
Basil	Ocimum basilicum	Tomato,[11][17][32][60][74] peppers,[14] oregano, asparagus, petunias, grapes	Chamomile, anise	Slugs and snails.[26] butterflies	asparagus beetle, hornworms,[17] mosquitoes,[17] thrips and flies[17]	Common rue, thyme	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 beans,[14] strawberry,[14][17][28] cucurbits (cucumber, squash[14][17]), fruit trees,[1] tomatoes[14][17] and cabbage		Predatory insects, honeybees	Many pests, tomato worm[17]		Predict a square metre for its adult size. Borage is a good companion for a wide variety of plants.[28]
Caraway	Carum carvi	Strawberries[28]		Parasitic wasps, parasitic flies		Dill[17]
Catnip	Nepeta cataria	Eggplant[17]			Flea beetles,[17] ants,[17] aphids[14]
Chamomile	Matricaria recutita	Most herbs,[14] brassicas,[11][14][27] cucumber,[14] wheat, onion,[14][17] cabbage[17]		Hoverflies, wasps			Growing near herbs will increase their oil production.
Chervil	Anthriscus cerefolium	Radish,[14][17] lettuce, broccoli			Aphids	Radish	Loves shade, fortunately it grows well with shade-tolerant food plants; will make radishes grown near it taste spicier
Chives	Allium schoenoprasum	Apples, carrots,[14][17] grapes,[14] roses,[14][17] tomatoes,[14] brassica (broccoli, cabbage, mustard, etc.), many others	Carrots		Cabbage worms, carrot fly, aphids,[14][17] mites,[17] nematodes[17]	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
Cilantro / Coriander	Coriandrum sativum	Anise[14] cabbage,[41] spinach, lettuce,[62] tomato[45][75]	Beans, peas	Tachinid fly, hoverflies[41][62]	Aphids,[14][17] spider mites, white flies and potato beetle	Dill	Attracts hoverflies which may in turn reduce pest populations in cabbages.[41] Will cross-pollinate easily with dill and ruin both plants.
Dill	Anethum graveolens	Brassicas,[5][11][14] broccoli,[11] cabbage,[17][40] corn,[17] eggplant/aubergine,[11] fennel,[81] lettuce,[14][17] onions,[14] cucumbers[17]	Fennel[81]	Tiger swallowtail butterflies/caterpillars, hoverflies, wasps, ladybugs, tomato hornworm, honeybees, ichneumonid wasps	Aphids,[17] spider mites,[17] squash bugs, cabbage looper	Carrots, tomatoes, cilantro	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.
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Fennel	Foeniculum vulgare	Dill[81]	Dill[81]	Ladybugs, syrphid fly,[62] tachinid fly	Aphids[14][62]	Almost everything	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.[81] Because it attracts syrphidae it reduces aphids through predation.[62]
Flax	Linum usitatissimum	Carrots and potatoes			Colorado potato beetle	Almost everything	Flax contains tannin and linseed oils which may offend the Colorado potato bug[82]
Garlic	Allium sativum	Vetch,[29] brassicas,[14] beets,[14] roses,[14][29] tomatoes,[2][14][29] cucumbers,[55][56] lettuce, celery, peas,[48] Chinese cabbage,[43] potatoes[4][70]	Tarragon, peas[48]		Aphids,[14][17] Japanese beetles,[17] mites,[17] cabbage looper, ants, cabbage maggot, fruit borers,[29] red spider mites,[29] diamondback moth on Chinese cabbage,[43] slugs[83]	Cabbages, grapes[44]	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.[48] Tarragon makes garlic grow rapidly.
Hyssop	Hyssopus officinalis	Brassicas,[5][11] cabbage,[14] grapes[14][17]		Honeybees, butterflies	Cabbage moth larvae, cabbage butterflies	Radishes[17]	Stimulates growth of grapes.
Lavender	Lavandula angustifolia, L. dentata, L. stoechas	Chamomile, lettuce, brassicas, onions, tomatoes, oregano, thyme, marjoram, sage, rosemary, basil, lemon balm, squash
Lemon grass	Cymbopogon citratus	Eggplant[84]			Cutworms		Has been shown to reduce cutworms in eggplant in laboratory trials but needs field testing
Lovage	Levisticum officinale	Beans[14]		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	Grapes, tomatoes, peppers, pumpkin,[14] many other plants	Basil	Hoverflies/Syrphidae[62]	Aphids[62]		Provides ground cover and much-needed humidity for pepper plants if allowed to spread among them. Because it attracts syrphidae, it reduces aphids through predation.[62]
Parsley	Petroselinum crispum	Asparagus,[15][16] corn/maize, tomatoes	Apple, asparagus,[15][16] rose	Swallowtail butterflies, wasps, flies		Alliums, lettuce	Sacrificially attracts insects that feed on tomatoes
Peppermint	Mentha piperita	Alliums,[10][11] brassicas,[5][10][11] cabbage,[11][14][17] peas,[14] tomatoes[14]			Cabbage root fly,[10] ants,[14] cabbage looper, aphids,[14] onion fly[10]		Repels cabbage flies, has same general companion properties as other mints
Rosemary	Rosmarinus officinalis	Cabbage,[17] beans,[14][17][23] brassicas,[5][11] carrots,[14] thyme			Bean beetle		Deters cabbage flies, repels many bean parasites
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Sage	Salvia officinalis	Brassicas,[5][11] rosemary, cabbage,[14][17] beans, Brussels sprouts,[11][36] carrots,[14] strawberry,[14] tomato,[14] marjoram[14]		Honeybees, cabbage butterfly	Cabbage flies, carrot fly, black flea beetle, cabbage looper, cabbage maggot, repels many bean parasites	Avoid any member of the allium family and common rue
Southernwood	Artemisia abrotanum	Brassicas,[5][11] fruit trees					Controls cabbage moths and malaria mosquitoes.
Spearmint	Mentha spicata	Alliums,[10][11] brassicas,[5][10][11] cabbage,[11][14][17] peas,[14] tomatoes[14]			Ants,[14] aphids,[14] onion fly,[10] cabbage root fly[10]		Controls ants and aphids, has same general companion properties as other mints.
Stinging nettle	Urtica dioica	Chamomille, mint, broccoli, tomatoes, valerian, angelica archangelica, marjoram, sage & peppermint			Aphids
Summer savoury	Satureja hortensis	Beans,[12] melon,[14] onions[14]					Also delays germination of certain foul herbs
Tarragon	Artemisia dracunculus	Most vegetables,[14] but especially eggplant					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	Thymus vulgaris	Brassicas,[5][11][32] cabbage,[17] eggplant/aubergine,[14] potato,[14] strawberry,[14] tomato,[14][32] Brussels sprouts[11][36]		Hoverflies/Syrphidae[62]	Cabbage worm,[17][32] cabbage weevil,[32] cabbage looper,[32] aphids,[62] whitefly		Because it attracts syrphidae it reduces aphids through predation.[62]
Wormwood	Artemisia absinthium	Brassicas,[5] carrots[14]			Ants[14]		Wormwood should be used with caution around most vegetables since it does contain toxins.[14]
Yarrow	Achillea millefolium	Many plants, "Most aromatic plants."[14]		Predatory wasps, ladybugs, hoverflies,[62] damselbugs	Aphids[62]		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.[62]

Flowers

Flowers
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Alyssum	Lobularia maritima	Grapes,[11] lettuce[62]		Syrphidae[62] and most beneficial insects	Aphids[62]		Because they attract syrphidae they help reduce aphids through predation.[11][62]
Baby's breath	Gypsophila paniculata			Syrphidae[62]	Aphids[62]		Because they attract syrphidae they help reduce aphids through predation.[62]
Bee balm	Monarda spp.	Tomato[12][14]		Bees
Californian poppy	Eschscholzia californica			Syrphidae[62]	Aphids[62]		Because they attract syrphidae they help reduce aphids through predation.[62]
Dianthus	Dianthus caryophyllus	Roses, lavender, echinacea, aster, foxglove			Slugs
Geraniums	Pelargonium spp.	Roses, corn, peppers, grapes			Leafhoppers, Japanese beetles	Tomatoes, tobacco, eggplants and other nightshades	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	Delphinium spp.	Beans,[14] cabbage[14]
Lupin	Lupinus	Cucurbits, brassica, lettuce, rosemary, dill, strawberry,[28] rose	Summer savory, rose	Honeybees		Tomatoes and other solanaceae	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	Tagetes patula, T. erecta, T. minuta	Most plants, especially tomatoes[14] and peppers, cucurbits (cucumbers, gourds, squash, potatoes,[14] roses,[14] alliums,[10][11] brassicas,[10][11][31] zucchini[32]	Rose	Snails and slugs.[26]	Root-knot nematodes,[85][86] beet leaf hoppers, cucumber beetle,[32] squash bug,[32] onion fly,[10] cabbage root fly[10]		Marigolds are a wonder-drug of the companion plant world, invoking the saying "plant them everywhere in your garden". 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.[87] Same with lupin, planting nearby roses causes them to grow vigorously.
Nasturtium	Tropaeolum majus	Beans, squash,[14][20] tomatoes, fruit trees, brassicas,[11][32] radish[14][17] cucumbers[14]		Predatory insects	Aphids,[14] asparagus beetle,[14] cabbage looper,[14][32] cabbage worm,[14][32] carrot fly,[14] cabbage weevil,[32] Colorado potato beetle[14] squash bug,[14][32] Japanese beetle,[14] Mexican bean beetle,[14] striped pumpkin beetles, whitefly,[14] cucumber beetles[14] flea beetle[14]	Cauliflower	Trap crops for aphids, is among the best at attracting predatory insects, deters many pests of cucurbits
Pansy	Viola x wittrockiana	Alliums, onions, roses	Roses		Bees, butterflies, ants	Ants (with aphids), snails, slugs, white butterfly	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	Petunia x hybrida	Cucurbits (squash, pumpkins, cucumbers), asparagus			Leafhoppers, Japanese beetles, aphids, asparagus beetle		Is a trap crop almost identical to geraniums in function
Phacelia	Phacelia tanacetifolia	Plants which are prone to aphids, especially lettuce, tomato, rose		hoverfly			This plant attracts hoverflies and is good around plants which are prone to aphids.[88]
Rose	Rosa spp.		Chives,[14][17] garlic,[14] marigolds[14]
Sunflower	Helianthus annuus	Peppers,[66][67] corn, cucumber,[22] soybeans,[50] tomatoes, swan plant	Swan plant		Aphids	Pole beans[12]	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. Works as a trap plant for thrips keeping them off of bell peppers.[67] Planting near swan plants help sunflowers grow rapidly.
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Swan plant	Gomphocarpus physocarpus, Asclepias physocarpa, milkweed	Sunflower	Sunflower, basil	Monarch butterfly	Aphids	Plants that attracts aphids and spider mites	Attracts the monarch butterfly during spring and summer. Basil repels pests that attracts by the swan plant like aphids.
Sweet pea	Lathyrus odoratus		Brassica, spinach, silverbeet and salads	Bees		Aphids	An annual climbing plant, which is like the edible pea. Makes a good decoration in your garden or fence.
Tansy	Tanacetum vulgare	Beans, brassicas,[11] cucurbits (cucumbers, squash, etc.), raspberries and relatives, roses, corn, fruit trees[1]		Ladybugs, honeybees	flying insects(Ichneumonid wasps), ants,[14] Japanese beetles,[14] cabbage butterfly,[14] cabbage maggot,[14] asparagus beetle,[14] carrot fly,[14] striped cucumber beetles,[14] Colorado potato beetle,[14] cutworm,[14] flea beetle,[14] flies,[14] imported cabbageworm,[14] squash bugs,[14] mice		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	Zinnia	Beans, tomatoes, peppers			Whiteflies		Attracts hummingbirds that eat whiteflies, attracts pollinators

Other

Other
Common name	Scientific name	Helps	Helped by	Attracts	-Repels/+distracts	Avoid	Comments
Alfalfa	Medicago sativa	Cotton		Assassin bug, big-eyed bug, ladybug, parasitic wasps	Lygus bugs	Tomatoes,[77] fava beans	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[77]
Peanut	Arachis hypogaea	Beans, corn, cucumber, eggplant, lettuce, marigold, melon and sunflower					Peanuts encourage growth of corn and squash[89]
Walnut tree	Juglans spp.	Many types of grass including Kentucky bluegrass (Poa pratensis).	European alder (sacrifice plant), hairy vetch,[90] crownvetch,[90] sericea lespedeza[90]			Apple trees,[78] grasses[90]	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.

See also

• Push–pull agricultural pest management
• Sustainable agriculture
• Sustainable landscaping
• Sustainable gardening

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External links

• Bohnsack, U. Companion Planting Guide.
• Companion plants by Professor Stuart B. Hill Department of Entomology Macdonald College
• Cass County Extension Companion Planting List
• Companion Planting Infographic

Further reading

• Cunningham, Sally Jean. Great Garden Companions: A companion planting system for a beautiful, chemical-free vegetable garden. 1998. ISBN 0-87596-847-3
• Hylton, W. The Rodale Herb Book, Eighth Printing. Rodale Press. 1974. ISBN 0-87857-076-4