List of companion plants

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 nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
AlliumsAlliumFruit 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, marigolds (Tagetes spp.),[9] mints[9]Thrips-rabbits,[5] slugs (see Garlic), -aphids,[6] carrot fly,[7] -cabbage loopers,[6] -cabbage maggots,[6] -cabbage worms,[6] -Japanese beetles[6]Beans,[10] peas[11]Alliums are a family of plants which include onions, garlic, leeks, shallots, chives, and others.
AsparagusAsparagus officinalisTomatoes,[12] parsley[13][14]Aster family flowers, dill, coriander, tomatoes,[13][14] parsley,[13][14] basil,[14] comfrey, marigolds, nasturtiumsCoupled with basil seems to encourage lady bugsOnion, garlic, potatoes, gladiolus
Beans, bushPhaseolus vulgarisCucumber,[14] soybeans, strawberries[15]Celery,[5][14] strawberries,[10][14] grains[16]Fennel,[10] soybeans,[16] dry beans,[16] alfalfa[16]"Lettuce, potato, tomato, other legumes, crucifers, or cucurbits increase sclerotinia" in the soil and should be avoided before and after snap beans.[16] See the entry for "Legumes" for more info
Beans, polePhaseolus vulgarisRadishes, Corn[10]Sunflowers,[10] beets,[10] brassicas,[12] kohlrabi[17]the stalk of the corn provides a pole for the beans to grow on, which then gives nitrogen to the soil of the corn.[18] As for the Radishes, see the entry for "Legumes" for more info
Beans, favaVicia fabaStrawberries, Celery[19]See the entry for "Legumes" for more info
Common nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
BeetsBeta vulgarisBroccoli,[5] bush beans,[10][20] cabbage,[20] lettuce,[20] kohlrabi,[12][21] onions,[12] brassicas,[20][17] passion fruit[22]Bush beans,[12][20] onions,[12] kohlrabi,[12][21] catnip, garlic,[12] lettuce,[10] most brassicas,[10] mintRunner or pole beans[12]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.
BrassicasBrassicaBeets,[10] onions,[12] potatoes, cereals (e.g. corn, wheat)Beets,[20][17] spinach,[17] chard,[17] Aromatic plants or plants with many blossoms, such as celery,[17] chamomile,[12][17] and marigolds.[9][23] Dill,[5][12] sage,[5] peas, peppermint,[5][9] spearmint, spurrey, rosemary,[5] rye-grass, garlic,[12] onions[17][24] and potatoes.[5] geraniums, alliums,[5] nasturtium,[24] borage, hyssop,[5] tansy, tomatoes, thyme,[5][24] wormwood,[5] southernwood,[5] beans,[16] cloverWirewormsMustards, nightshades (tomatoes,[12][17] peppers, etc.), pole beans,[12][17] strawberries[12][17]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.[24]
BroccoliBrassica oleraceaLettuce[25]Mixture of mustard, pac choi, and rabe. Beets, dill,[5] lettuce,[25] mustard, onions,[20] tomato,[26] turnip,[27] clover[26]Broccoli as a main crop intercropped with lettuce was shown to be more profitable than either crop alone.[25] Turnip acts as a trap crop.[27] See brassicas entry for more info
Brussels sproutsBrassica oleraceaSage,[28] thyme,[28] clover,[28] malting barley
CabbageBrassica oleracea / Brassica chinensisBeans,[10] celery[5]Beans,[14] clover,[29][30] calendula/pot marigold,[31] chamomile,[20] larkspur,[12] nasturtiums,[20] dill,[20][32] coriander,[33] hyssop,[12] onions,[12][20] beets,[20] marigolds, mint,[12][20] rosemary,[20] sage,[12][20] thyme,[20] tomatoes, lacy phacelia, Green onions with Chinese cabbage.Snails and slugs[34]Grapes[35]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. Nasturtiums repel cabbage moths[20]
CarrotsDaucus carotaTomatoes,[36] alliums,[7] beans,[10] leeks,[11] lettuce,[12][37] onions,[7] passion fruit[22]Lettuce,[37] alliums (chives,[12] leeks,[12] onions,[7][12][13] shallots, etc.), rosemary,[12] wormwood,[12] sage,[12] beans, flaxAssassin bug, lacewing, parasitic wasp, yellow jacket and other predatory waspsLeek moth,[13] onion fly[7][13]Dill, parsnip, radishTomatoes 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.
CauliflowerBrassica oleraceaBeans,[10] celery,[5] spinach, peas[38]Mixture of Chinese cabbage, marigolds, rape, and sunflower. Spinach, peas[38]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.
CeleryApium graveolensBush beans,[5][14] brassicas,[5][17] cucumber[39]Cosmos, daisies, snapdragons, leeks,[5] tomatoes,[5] cauliflower,[5] cabbage,[5] bush beans[5]Whiteflies[39]Corn, aster flowersAster flowers, can transmit the aster yellows disease
Common nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
ChardBeta vulgaris ssp. ciclaBrassicas,[17] passion fruit[22]
Corn / MaizeZea maysBeans,[14][20] cucurbits,[12] soybeans,[40] tomatoes[41]Sunflowers, dill,[20] legumes (beans,[12][14][20] peas,[12] soybeans etc.), peanuts, cucurbits,[12] clover,[42] amaranth,[43] white geranium, pigweed,[12] lamb's quarters, morning glory, parsley, and potato,[12] field mustard,[44] Sudan grassTomato,[45] celeryProvides beans with a trellis, is protected from predators and dryness by cucurbits, in the three sisters technique
CucumberCucumis sativusBeans,[10][20] kohlrabi,[21] lettuce[12]Kohlrabi,[21] nasturtiums,[12] radishes,[45] marigolds, sunflowers,[45] peas,[45] beans,[14][20][45] chamomile,[12] beets, carrots, dill,[20] onions,[46] garlic,[46][47] amaranth (Amaranthus cruentus),[48] celery,[39] Malabar spinach[39]Beneficial for ground beetlesRaccoons,[12] ants[12]Potato,[12] aromatic herbs[12]Sow 2 or 3 radish seeds in with cucumbers to repel cucumber beetles.[12] One study showed a 75% reduction in cucumber beetles with the concurrent seeding of amaranth.[48] Various sprays from lettuce, asparagus, Malabar spinach, and celery were found to reduce whiteflies.[39] See cucurbits entry for more info
CucurbitsCucurbitaceaeCorn[12]Corn,[12] grain sorghum[49]Cucurbits are a family of plants that includes melons, cucumbers, gourds, pumpkins, and squash
Eggplant or AubergineSolanum melongenaBeans, peppers, tomatoes,[50] passion fruit[22]Marigolds, catnip,[20] dill, redroot pigweed,[45] green beans,[45] tarragon, mints, thyme[12]Marigolds will deter nematodes.
KohlrabiBrassica oleracea v. gongylodesOnion,[12][21] beets,[21] aromatic plants,[21] cucumbers[21]Beets,[12][21] cucumbers[21]See Brassicas entry for more info
LeekAllium ampeloprasum v. porrumCarrots,[12] celery,[21] onions,[21] tomato,[51] passion fruit[22]Carrots[11] clover,[52]Swiss chardSee Alliums entry for more info
LegumesPhaseolus and ViciaBeets,[12][20] lettuce,[53] okra,[53] potato,[14][54][55][56] spinach, dill, cabbage,[14] carrots, chards, eggplant,[45] peas, tomatoes,[14] brassicas,[16] corn,[12][14][20] cucumbers,[20][45] grapesSummer savory,[10][14] beets,[10][20] cucumbers,[10][20] borage,[12] cabbage,[10] carrots,[10] cauliflower,[10] corn,[14][20] larkspur,[12] lovage,[12] marigolds,[10][20] mustards,[12] radish,[10][20] potato,[54][55][56] peppermint,[16] rosemary,[12][20][16] lettuce,[53] onion, squash,[53] lacy phacelia[57]Snails and slugs[34]Colorado potato beetle[10][55]Alliums,[10][20] gladiolas[10][17]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.[16] Summer savory[20] and potatoes[55] repel bean beetles.
LettuceLactuca sativaBeets,[10] beans,[53] okra,[53] onions,[21] radish,[12] broccoli,[25] Carrots,[37] passion fruit[22]Radish, beets,[20] dill,[12][20] kohlrabi, onions,[12][21][24] beans,[53] carrots,[12][37] cucumbers,[12] strawberries,[12] broccoli[25] thyme,[24] nasturtiums,[24] alyssum,[58] cilantro[58]Slugs and snails.[34]Celery, cabbage, cress, parsleyMints (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.[25]
MustardSinapis albaBeans,[12] broccoli, cabbage, cauliflower, fruit trees,[12] grapes,[12] radish, brussels sprouts, turnipsVarious pestsSee Brassicas entry for more info. Mustard acts as a trap crop in broccoli.
Common nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
NightshadesSolanaceaeCarrots, alliums, mints (basil, oregano, etc.)Beans, black walnuts, corn, fennel, dill, brassicasNightshades are a family of plants which include tomatoes, tobacco, chili peppers (including bell peppers), potatoes, eggplant, and others
OkraAbelmoschus esculentusSweet potato, tomatoes,[50] peppers[59]Beans,[53] lettuce,[53] squash,[53] sweet potato, peppers[59]Okra and sweet potato are mutually beneficial when planted simultaneously.
OnionAllium cepaBeets,[12] beans, brassicas,[17][24] cabbage,[12][20] broccoli,[20] carrots,[7][12][13] lettuce,[12][21] cucumbers,[46] peppers,[3] passion fruit,[22] strawberries.[12] Green onions with Chinese cabbage.Carrots,[7] beets,[12] brassicas,[12] dill,[12] lettuce,[12] strawberries,[12] marigolds, mints, tomatoes,[12] summer savory,[12] chamomile,[12][20] pansyLentils, peas,[12]See Alliums entry for more info
ParsnipPastinaca sativaFruit treesA variety of predatory insectsThe 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.
PeasPisum sativumBrassicas, turnip,[38] cauliflower,[38] garlic,[38]Turnip,[38] cauliflower,[38] garlic,[38] mints[12]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.[38]
PeppersSolanaceae, CapsicumOkra[59]Beans,[60] tomatoes, marjoram, okra,[59] geraniums, petunias, sunflowers,[61][62] onions[3] crimson clover,[63] basil,[12] field mustard[44]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.[61]
PotatoSolanum tuberosumBrassicas,[5] beans,[54][55][56] corn,[12] peas,[64] passion fruit[22]Horseradish,[12][20] beans,[14][54][55][56] dead nettle,[12] marigolds,[12] peas,[7][64] onion,[4] garlic,[4][65] thyme,[12] clover[66]Mexican bean beetle[55]Atriplex, carrot, cucumber,[12] pumpkin,[67] raspberries, squash, sunflower, tomatoHorseradish increases the disease resistance of potatoes. It repels the potato bug.[20] Garlic was shown to be more effective than fungicides on late potato blight.[65] Peas were shown to reduce the density of Colorado potato beetles.[7]
Common nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
PumpkinCucurbita pepoCorn,[67] beansBuckwheat, Jimson weed,[67] catnip, oregano,[12] tansy, radishes, nasturtiumsspiders, ground beetlesPotatoes[67]Radishes can be used as a trap crop against flea beetles, cucurbita can be used in the three sisters technique. Nasturtiums repel squash bugs.[12]
RadishRaphanus sativusSquash[12] eggplant, cucumber,[12] lettuce,[20] peas,[20] beans,[10][20] pole beans,[10]Chervil,[12][20] lettuce,[12] nasturtiums[12][20]flea beetles, cucumber beetles[20]GrapesRadishes can be used as a trap crop against flea beetles. Radishes grown with lettuce taste better.[12]
SoybeanGlycine maxCorn,[40] snap beans, sunflower[40]A mixture of corn, mungbean, and sunflower was found to rid soybeans of aphids.[40] Snap beans act as a trap crop for Mexican bean beetles in soybeans.
SpinachSpinacia oleraceaBrassicas,[17] cauliflower, passion fruit[22]Strawberries,[68] peas, beans, cauliflowerThe peas and beans provide natural shade for the spinach. See cauliflower notes regarding mutualism with spinach.
SquashCucurbita spp.corn, beans,[53] okra,[53]Beans,[53] buckwheat, borage,[12][20] catnip, tansy, radishes,[12] marigolds,[24] nasturtiums[12][55]Spiders, ground beetlesRadishes can be used as a trap crop against flea beetles, cucurbita can be used in the three sisters technique. Marigolds[24] and nasturtiums repel squash bugs.[12][55] Marigolds repel cucumber beetles.[24]
Sweet potatoIpomoea batatasOkraOkraOkra and sweet potato are mutually beneficial when planted simultaneously.
TomatoesSolanum lycopersicumBrassicas, broccoli,[26] cabbage, celery,[5] roses,[12] peppers, asparagus[68]Asparagus,[13] basil,[20][24][51][69] beans,[14] bee balm (Monarda),[10][12] oregano, parsley, marigold,[12] alliums, garlic,[2][12] leeks,[51] celery, geraniums, petunias, nasturtium, borage,[12][20] coriander,[36][70] chives,[12] corn,[41] dill,[36] mustard,[36] fenugreek,[36] barley,[36] carrots,[36] eggplant,[50] mints,[12] okra,[50] sage,[12] thyme,[12][24] "flower strips"[71]Asparagus beetle[68]Black walnut,[12] alfalfa,[72] corn,[45] fennel,[12] chili peppers,[50] peas,[41] dill, potatoes,[12] beetroot, brassicas,[12] rosemaryBlack walnuts inhibit tomato growth,[12] 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%.[69] One study shows that growing chili peppers near tomatoes in greenhouses increases tomato whitefly on the tomatoes.[50]
Turnips and rutabagasBrassica rapa and Brassica napobrassicaPeas,[38][68] broccoli[27]Hairy vetch,[68] peas[38][68]hedge mustard,[68] knotweed[68]Turnips act as a trap crop for broccoli.[27] See peas regarding their mutualism with turnips.

Fruit

Fruit
Common nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
AppleMalus domesticaClover, chives, garlic, leeks, nasturtium, southernwood, daffodils, comfreyCedar because of apple-cedar rust. Walnut because its roots produce growth inhibitors that apple trees are sensitive to[73]
ApricotPrunus armeniacaPeppersA fungus that peppers are prone to can infect apricot trees causing a lot of harm.
BlueberriesVaccinium spp.Oak trees,[74] pine trees,[74] strawberries, clover, bay laurel, dewberries, yarrowtomatoes

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 treesVariousAlliums,[1] tansy,[1] nasturtiums,[1] marigolds,[1] marjoram,[1] lemon balm,[1] mustards,[12] dandelions,[12] borage[1]
GrapesVitis spp.Hyssop,[12][20] alyssum, basil, beans, chives,[12] geraniums, mustards,[12] oregano, clover, peas, blackberriesCabbage,[35] garlic,[35] radishes
MelonCucumis meloChamomile,[12] pigweed,[12] summer savoury,[12] sow thistle[12]
Passion fruitPassiflora edulisPotatoes,[22] beets,[22] Swiss chard,[22] carrots,[22] spinach,[22] strawberries,[22] eggplants,[22] onions,[22] leeks,[22] lettuce[22]Cucurbits,[22] maize,[22] cowpea,[22] sorghum,[22] okra,[22] sweet potatoes[22]
PearsPyrus spp."Aromatic plants"[75]
StrawberriesFragaria × ananassaBush beans,[10] lettuce,[12] onions,[12] spinach,[68] passion fruit[22]Caraway,[15] bush beans,[15] lupin,[15] onions,[12] sage,[12] thyme,[12] borage[12][20][15]Slugs and snails.[34]Brassicas,[15] Verticillium-susceptible species (tomatoes, potatoes, eggplant, peppers, melons, okra, mint, bush or bramble fruits, stone fruits, chrysanthemums, roses)[15]Thyme planted and/or placed next to each other help grow more strawberries quickly.

Herbs

Herbs
Common nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
AnisePimpinella anisum Coriander[12]Bees, butterflies and hummingbirds[76]Not to be confused with star anise which is an entirely different species.
BasilOcimum basilicumTomato,[20][24][51][69] peppers,[12] oregano, asparagus, petunias, grapesChamomile, aniseSlugs and snails.[34] butterfliesasparagus beetle, hornworms,[20] mosquitoes,[20] thrips and flies[20]Common rue, thymeIs said to make tomatoes taste better, chamomile and anise are supposed to increase the essential oils in many herbs like basil
BorageBorago officinalisAlmost everything, especially beans,[12] strawberry,[12][20][15] cucurbits (cucumber, squash[12][20]), fruit trees,[1] tomatoes[12][20] and cabbagePredatory insects, honeybeesMany pests, tomato worm[20]Predict a square metre for its adult size. Borage is a good companion for a wide variety of plants.[15]
CarawayCarum carviStrawberries[15]Parasitic wasps, parasitic fliesDill[20]
CatnipNepeta catariaEggplant[20]Flea beetles,[20] ants,[20] aphids[12]
ChamomileMatricaria recutitaMost herbs,[12] brassicas,[12][17] cucumber,[12] wheat, onion,[12][20] cabbage[20]Hoverflies, waspsGrowing near herbs will increase their oil production.
ChervilAnthriscus cerefoliumRadish,[12][20] lettuce, broccoliAphidsRadishLoves shade, fortunately it grows well with shade-tolerant food plants; will make radishes grown near it taste spicier
ChivesAllium schoenoprasumApples, carrots,[12][20] grapes,[12] roses,[12][20] tomatoes,[12] brassica (broccoli, cabbage, mustard, etc.), many othersCarrotsCabbage worms, carrot fly, aphids,[12][20] mites,[20] nematodes[20]Beans, peasSame 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 / CorianderCoriandrum sativumAnise[12] cabbage,[33] spinach, lettuce,[58] tomato[36][70]Beans, peasTachinid fly, hoverflies[33][58]Aphids,[12][20] spider mites, white flies and potato beetleAttracts hoverflies which may in turn reduce pest populations in cabbages.[33]
DillAnethum graveolensBrassicas,[5][12] broccoli, cabbage,[20][32] corn,[20] eggplant/aubergine, fennel,[77] lettuce,[12][20] onions,[12] cucumbers[20]Fennel[77]Tiger swallowtail butterflies/caterpillars, hoverflies, wasps, ladybugs, tomato hornworm, honeybees, ichneumonid waspsAphids,[20] spider mites,[20] squash bugs, cabbage looperCarrots, tomatoesOne of the few plants said to grow with fennel. See fennel for info about intercropping.
Common nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
FennelFoeniculum vulgareDill[77]Dill[77]Ladybugs, syrphid fly,[58] tachinid flyAphids[12][58]Almost everythingFennel is allelopathic to most garden plants, inhibiting growth, causing to bolt, or actually killing many plants.[78] When growing together a higher ratio of fennel to dill provides the highest profit. Dill has a stabilizing effect on the fennel seed.[77] Because it attracts syrphidae it reduces aphids through predation.[58]
FlaxLinum usitatissimumCarrots and potatoesColorado potato beetleAlmost everythingFlax contains tannin and linseed oils which may offend the Colorado potato bug[79]
GarlicAllium sativumVetch,[21] brassicas,[12] beets,[12] roses,[12][21] tomatoes,[2][12][21] cucumbers,[46][47] lettuce, celery, peas,[38] potatoes[4][65]Tarragon, peas[38]Aphids,[12][20] Japanese beetles,[20] mites,[20] cabbage looper, ants, cabbage maggot, fruit borers,[21] red spider mites,[21] slugs[80]Cabbages, grapes[35]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.[38] Tarragon makes garlic grow rapidly.
HyssopHyssopus officinalisBrassicas,[5] cabbage,[12] grapes[12][20]Honeybees, butterflies, beesCabbage moth larvae, cabbage butterfliesRadishes[20]Stimulates growth of grapes.
LavenderLavandula angustifolia, L. dentata, L. stoechasChamomile, lettuce, brassicas, onions, tomatoes, oregano, thyme, marjoram, sage, rosemary, basil, lemon balm, squashbutterflies, hummingbirds, bees
Lemon grassCymbopogon citratusEggplant[81]CutwormsHas been shown to reduce cutworms in eggplant in laboratory trials but needs field testing
LovageLevisticum officinaleBeans[12]Ichneumonid wasps, ground beetles (good)RhubarbIs thought to improve the health of almost all plants, like borage and geraniums, is considered a "magic bullet" of companion planting
OreganoOriganum vulgareGrapes, tomatoes, peppers, pumpkin,[12] many other plantsBasilHoverflies/Syrphidae[58]Aphids[58]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.[58]
ParsleyPetroselinum crispumAsparagus,[13][14] corn/maize, tomatoesApple, asparagus,[13][14] roseSwallowtail butterflies, wasps, fliesAlliums, lettuceSacrificially attracts insects that feed on tomatoes
PeppermintMentha piperitaAlliums,[9] brassicas,[5][9] cabbage,[12][20] peas,[12] tomatoes[12]Cabbage root fly,[9] ants,[12] cabbage looper, aphids,[12] onion fly[9]Repels cabbage flies, has same general companion properties as other mints
RosemaryRosmarinus officinalisCabbage,[20] beans,[12][20][16] brassicas,[5] carrots,[12] thymeBean beetleDeters cabbage flies, repels many bean parasites
Common nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
SageSalvia officinalisBrassicas,[5] rosemary, cabbage,[12][20] beans, Brussels sprouts,[28] carrots,[12] strawberry,[12] tomato,[12] marjoram[12]Honeybees, cabbage butterflyCabbage flies, carrot fly, black flea beetle, cabbage looper, cabbage maggot, repels many bean parasitesAvoid any member of the allium family and common rue
SouthernwoodArtemisia abrotanumBrassicas,[5] fruit treesControls cabbage moths and malaria mosquitoes.
SpearmintMentha spicataAlliums,[9] brassicas,[5][9] cabbage,[12][20] peas,[12] tomatoes[12]Ants,[12] aphids,[12] onion fly,[9] cabbage root fly[9]Controls ants and aphids, has same general companion properties as other mints.
Stinging nettleUrtica dioicaChamomille, mint, broccoli, tomatoes, valerian, angelica archangelica, marjoram, sage & peppermintAphids
Summer savourySatureja hortensisBeans,[10] melon,[12] onions[12]Also delays germination of certain foul herbs
TarragonArtemisia dracunculusMost vegetables,[12] but especially eggplantIts 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.
ThymeThymus vulgarisBrassicas,[5][24] cabbage,[20] eggplant/aubergine,[12] potato,[12] strawberry,[12] tomato,[12][24] Brussels sprouts[28]Hoverflies/Syrphidae[58]Cabbage worm,[20][24] cabbage weevil,[24] cabbage looper,[24] aphids,[58] whiteflyBecause it attracts syrphidae it reduces aphids through predation.[58]
WormwoodArtemisia absinthiumBrassicas,[5] carrots[12]Ants[12]Wormwood should be used with caution around most vegetables since it does contain toxins.[12]
YarrowAchillea millefoliumMany plants, "Most aromatic plants."[12]Predatory wasps, ladybugs, hoverflies,[58] damselbugsAphids[58]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.[58]

Flowers

Flowers
Common nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
AlyssumLobularia maritimaGrapes, lettuce[58]Syrphidae[58] and most beneficial insectsAphids[58]Because they attract syrphidae they help reduce aphids through predation.[58]
Baby's breathGypsophila paniculataSyrphidae[58]Aphids[58]Because they attract syrphidae they help reduce aphids through predation.[58]
Bee balmMonarda spp.Tomato[10][12]Bees
Californian poppyEschscholzia californicaSyrphidae[58]Aphids[58]Because they attract syrphidae they help reduce aphids through predation.[58]
DianthusDianthus caryophyllusRoses, lavender, echinacea, aster, foxgloveSlugs
GeraniumsPelargonium spp.Roses, corn, peppers, grapesLeafhoppers, Japanese beetlesTomatoes, tobacco, eggplants and other nightshadesA 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
LarkspurDelphinium spp.Beans,[12] cabbage[12]
LupinLupinusCucurbits, brassica, lettuce, rosemary, dill, strawberry,[15] roseSummer savory, roseHoneybeesTomatoes and other solanaceaeThis 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.
MarigoldTagetes patula, T. erecta, T. minutaMost plants, especially tomatoes[12] and peppers, cucurbits (cucumbers, gourds, squash, potatoes,[12] roses,[12] alliums,[9] brassicas,[9][23] zucchini[24]RoseSnails and slugs.[34]Root-knot nematodes,[82][83] beet leaf hoppers, cucumber beetle,[24] squash bug,[24] onion fly,[9] cabbage root fly[9]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.[84] Same with lupin, planting nearby roses causes them to grow vigorously.
NasturtiumTropaeolum majusBeans, squash,[12][55] tomatoes, fruit trees, brassicas,[24] radish[12][20] cucumbers[12]Predatory insectsAphids,[12] asparagus beetle,[12] cabbage looper,[12][24] cabbage worm,[12][24] carrot fly,[12] cabbage weevil,[24] Colorado potato beetle[12] squash bug,[12][24] Japanese beetle,[12] Mexican bean beetle,[12] striped pumpkin beetles, whitefly,[12] cucumber beetles[12] flea beetle[12]CauliflowerTrap crops for aphids, is among the best at attracting predatory insects, deters many pests of cucurbits
PansyViola x wittrockianaAlliums, onions, rosesRosesBees, butterflies, antsAnts (with aphids), snails, slugs, white butterflyA 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.
PetuniaPetunia x hybridaCucurbits (squash, pumpkins, cucumbers), asparagusLeafhoppers, Japanese beetles, aphids, asparagus beetleIs a trap crop almost identical to geraniums in function
PhaceliaPhacelia tanacetifoliaPlants which are prone to aphids, especially lettuce, tomato, rosehoverflyThis plant attracts hoverflies and is good around plants which are prone to aphids.[85]
RoseRosa spp.Chives,[12][20] garlic,[12] marigolds[12]
SunflowerHelianthus annuusPeppers,[61][62] corn, cucumber,[45] soybeans,[40] tomatoes, swan plantSwan plantAphidsPole beans[10]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.[62] Planting near swan plants help sunflowers grow rapidly.
Common nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
Swan plantGomphocarpus physocarpus, Asclepias physocarpa, milkweedSunflowerSunflower, basilMonarch butterflyAphidsPlants that attracts aphids and spider mitesAttracts the monarch butterfly during spring and summer. Basil repels pests that attracts by the swan plant like aphids.
Sweet peaLathyrus odoratusSweet alyssum, lobelia, roses, lavender, catmint[86] Brassica, spinach, silverbeet and saladsBees, butterfliesAphidsAn annual climbing plant, which is like the edible pea. Makes a good decoration in your garden or fence.
TansyTanacetum vulgareBeans, brassicas, cucurbits (cucumbers, squash, etc.), raspberries and relatives, roses, corn, fruit trees[1]Ladybugs, honeybeesflying insects(Ichneumonid wasps), ants,[12] Japanese beetles,[12] cabbage butterfly,[12] cabbage maggot,[12] asparagus beetle,[12] carrot fly,[12] striped cucumber beetles,[12] Colorado potato beetle,[12] cutworm,[12] flea beetle,[12] flies,[12] imported cabbageworm,[12] squash bugs,[12] miceToxic to people and many animals, don't plant it where livestock browse. Is reputed to generally repel insects (except for nectar-eating types).
ZinniaZinniaBeans, tomatoes, peppersWhitefliesAttracts hummingbirds that eat whiteflies, attracts pollinators

Other

Other
Common nameScientific nameHelpsHelped byAttracts-Repels/+distractsAvoidComments
AlfalfaMedicago sativaCottonAssassin bug, big-eyed bug, ladybug, parasitic waspsLygus bugsTomatoes,[72] fava beansUsed 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[72]
PeanutArachis hypogaeaBeans, corn, cucumber, eggplant, lettuce, marigold, melon and sunflowerPeanuts encourage growth of corn and squash[79]
Walnut treeJuglans spp.Many types of grass including Kentucky bluegrass (Poa pratensis).European alder (sacrifice plant), hairy vetch,[87] crownvetch,[87] sericea lespedeza[87]Apple trees,[73] grasses[87]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

References

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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
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