This is a list of companion plants, traditionally planted together. Many more are in the list of beneficial weeds. Companion planting is thought by its practitioners to assist in the growth of one or both plants involved in the association. Possible mechanisms[1] include attracting beneficial insects,[2]repelling pests,[3] or providing nutrients such as by fixing nitrogen,[4] shade, or support. Companion plantings can be part of a biological pest control program.[5] A large number of companion plant associations have been proposed; only a few of these have been subjected to scientific testing. Thus where a table column for example states "Helps" or "Helped by", this is to be read as meaning that traditional companion planting involves putting the named plants in that column into an association with the plant named at the left of the row, with the intention of causing the one plant to help or be helped by the other. Mechanisms that have been scientifically verified include using strongly aromatic plants to deter pests; using companions to hide crops from pests; providing plants as nurseries for beneficial insects including predators and parasitoids; trap cropping;[6] and allelopathy, where a plant inhibits the growth of other species.[7]
Vegetables
Companion plantings traditionally used for vegetables
"Lettuce, potato, tomato, other legumes, crucifers, or cucurbits increase sclerotinia" in the soil and should be avoided before and after snap beans.[19] See the entry for "Legumes" for more info
the stalk of the corn provides a pole for the beans to grow on, which then gives nitrogen to the soil of the corn. Beans and corn are (with squash) traditional "Three Sisters" plants. As for Radishes, see the entry for "Legumes".
bush beans,[6] cabbage,[6] lettuce,[6] kohlrabi, onions, brassicas,[6][20] passion fruit[22]
Bush beans,[6] onions, kohlrabi, catnip,[23] garlic, mint
Runner or pole beans
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.
Beets,[6][20] spinach,[20] chard,[20] Aromatic plants or plants with many blossoms, such as celery,[20] chamomile,[20] and marigolds.[15][24] Dill, sage, peas,[25] peppermint,[15] spearmint,[26] rosemary, rye-grass,[27] garlic, onions[20][28] and potatoes. geraniums, alliums, nasturtium,[28] borage, hyssop, tomatoes,[29] thyme,[28] wormwood, southernwood, beans,[19] clover[30]
Wireworms
Mustards, nightshades (tomatoes,[20] peppers, etc.), pole beans,[20] strawberries[20]
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.[28]
Broccoli as a main crop intercropped with lettuce was shown to be more profitable than either crop alone. Turnip acts as a trap crop.[32] See brassicas entry for more info
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[6]
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. 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 wild carrot, Queen Anne's Lace, for the same effect.
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.[55] Various sprays from lettuce, asparagus, Malabar spinach, and celery were found to reduce whiteflies.[47] See cucurbits entry for more info
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.[19] Summer savory[6] and potatoes[62] repel bean beetles.
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.
Peas when intercropped with turnips, cauliflower, or garlic showed mutual suppression of growth however their profit per land area used was increased.[44]
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; pepper plants grown together, or with tomatoes, can shelter the fruit from excess sunlight, and raise the humidity level. Sunflowers, when in bloom at the right time, shelter beneficial insects, lowering thrips populations.[69]
Horseradish increases the disease resistance of potatoes. It repels the potato bug.[6] Garlic is more effective than fungicides on late potato blight.[73] Peas were shown to reduce the density of Colorado potato beetles.[13]
Radishes can be used as a trap crop against flea beetles, cucurbita can be used in the three sisters technique. Marigolds[28] and nasturtiums repel squash bugs.[62] Marigolds repel cucumber beetles.[28]
Black walnut, alfalfa,[80] corn, fennel, chili peppers,[57] peas,[49] dill, potatoes, beetroot, brassicas, rosemary
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%.[75] One study shows that growing chili peppers near tomatoes in greenhouses increases tomato whitefly on the tomatoes.[57]
Cucumbers and squash can be used as living mulch, or green mulch, around tomato plants. The large leaves of these vining plants can help with soil moisture retention.[79]
Oak trees,[83] pine trees,[83] 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.
Brassicas,[18] Verticillium-susceptible species (tomatoes, potatoes, eggplant, peppers, melons, okra, mint, bush or bramble fruits, stone fruits, chrysanthemums, roses)[18]
Thyme planted and/or placed next to each other help grow more strawberries quickly.
Fennel is allelopathic to most garden plants, inhibiting growth, causing to bolt, or actually killing many plants.[87] When growing together a higher ratio of fennel to dill provides the highest profit. Dill has a stabilizing effect on the fennel seed.[86] Because it attracts syrphidae it reduces aphids through predation.[65]
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.[44] Tarragon makes garlic grow rapidly.
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.[65]
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.
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.[65]
Flowers
Companion plantings traditionally used for flowers
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
Cucurbits, brassica, lettuce, rosemary, dill, strawberry,[18] 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.
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.[93] Same with lupin, planting nearby roses causes them to grow vigorously.
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.
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.[70] Planting near swan plants help sunflowers grow rapidly.
^Parker, Joyce E.; Snyder, William E.; Hamilton, George C.; Rodriguez-Saona, Cesar (2013). "Companion Planting and Insect Pest Control". Weed and Pest Control - Conventional and New Challenges. InTech. pp. 1–26. doi:10.5772/55044. ISBN978-953-51-0984-6.
^Wagner, S. C. (2011). "Biological Nitrogen Fixation". Nature Education Knowledge. 3 (10): 15. Archived from the original on 13 September 2018. Retrieved 1 May 2019.
^ abcdefghijklMateeva, A.; Ivanova, M.; Vassileva, M. (2002). "Effect of intercropping on the population density of pests in some vegetables". Acta Horticulturae. 579 (579): 507–511. doi:10.17660/ActaHortic.2002.579.88.
^ abcdRousse, P.; Fournet, S.; Porteneuve, C.; Brunel, E. (2003). "Trap cropping to control Delia radicum populations in cruciferous crops: first results and future applications". Entomologia Experimentalis et Applicata. 109 (2): 133–138. Bibcode:2003EEApp.109..133R. doi:10.1046/j.1570-7458.2003.00098.x. S2CID84486637.
^Björkman, Maria; Hambäck, Peter A.; Hopkins, Richard J.; Rämert, Birgitta (2010). "Evaluating the enemies hypothesis in a clover-cabbage intercrop: effects of generalist and specialist natural enemies on the turnip root fly (Delia floralis)". Agricultural and Forest Entomology. 12 (2): 123–132. doi:10.1111/j.1461-9563.2009.00452.x. S2CID84358785.
^ abcdefSnails and Slugs(PDF) (Technical report). University of California Statewide Integrated Pest Management Program. November 2009. Pest Notes 7427.
^ abcdeZhao, Qing; Zhu, Junwei J.; Qin, Yuchuan; Pan, Pengliang; Tu, Hongtao; Du, Wenxiao; Zhou, Wangfang; Baxendale, Frederick P. (2014). "Reducing whiteflies on cucumber using intercropping with less preferred vegetables". Entomologia Experimentalis et Applicata. 150 (1): 19–27. Bibcode:2014EEApp.150...19Z. doi:10.1111/eea.12135. S2CID84569641.
^ abPitan, O. O.; Esan, E. O. (2013). "Intercropping cucumber with amaranth (Amaranthus cruentus L.) to suppress populations of major insect pests of cucumber (Cucumis sativus L.)". Archives of Phytopathology and Plant Protection. 47 (9): 1112–1119. doi:10.1080/03235408.2013.830809. S2CID84412234.
^De Costa, W. A. J. M.; Perera, M. K. K. W. (1998). "Effects of Bean Population and Row Arrangement on the Productivity of Chilli/Dwarf Bean (Capsicum annuum/Phaseolus vulgaris L.) Intercropping in Sri Lanka". Journal of Agronomy and Crop Science. 180 (1): 53–58. Bibcode:1998JAgCS.180...53D. doi:10.1111/j.1439-037X.1998.tb00369.x.
^Beizhou, Song; Jie, Zhang; Jinghui, Hu; Hongying, Wu; Yun, Kong; Yuncong, Yao (2011). "Temporal dynamics of the arthropod community in pear orchards intercropped with aromatic plants". Pest Management Science. 67 (9): 1107–1114. doi:10.1002/ps.2156. PMID21480464.
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