Vegetables |
Common name |
Scientific name |
Helps |
Helped by |
Attracts |
Repels/Distracts |
Avoid |
Comments |
Alliums |
Allium |
fruit trees, nightshades (tomatoes, capsicum peppers, potatoes), brassicas (cabbage, broccoli, kohlrabi, etc.) carrots |
carrots |
|
slugs, aphids, carrot fly, cabbage worms[1] |
beans, peas, parsley |
Alliums include onions, garlic, leeks, shallots, chives, and others |
Asparagus |
Asparagus officinalis |
Tomatoes[2] |
Aster Family flowers, Dill, Coriander, Tomatoes, Parsley, Basil, Comfrey, Marigolds |
coupled with Basil seems to encourage lady bugs |
|
Onion, Garlic, Potatoes |
|
Brassicas |
Brassica |
potatoes, cereals (e.g. corn, wheat) |
geraniums, dill, alliums (onions, shallots, garlic, etc.), rosemary, nasturtium, borage |
|
wireworms |
mustards, nightshades (tomatoes, peppers, etc.) |
Brassicas are a family of species which include broccoli, cabbage, Brussels sprouts, kohlrabi, and cauliflower. |
Beans |
Phaseolus |
Corn (see Three Sisters), Spinach, lettuce, rosemary, summer savory, dill, carrots, brassicas, beets, radish, strawberry and cucumbers and mint |
Eggplant, Summer savoury |
|
California beetles |
Tomatoes, chili peppers, alliums (onions, garlic, etc.), brassicas (cabbage, broccoli, etc.) |
Hosts nitrogen-fixing bacteria, a good fertiliser for some plants, too much for others |
Beets |
Beta Vulgaris |
lettuce, kohlrabi, onions and brassicas |
Catnip, Garlic, Mint |
|
|
Runner or pole beans[2] |
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. |
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, kohlrabi, 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, kohlrabi, 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
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. |
Celery |
Apium graveolens |
|
Cosmos, Daisies, Snapdragons |
|
|
corn, Aster flowers |
Aster flowers, can transmit the aster yellows disease |
Corn / Maize |
Zea mays |
beans |
Sunflowers, legumes (beans, peas, soybeans etc.), peanuts, cucurbits
(squash, cucumbers, melons, etc.), amaranth, white geranium, lamb's
quarters, morning glory, parsley, and potato[2] |
|
|
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 or Aubergine |
Solanum melongena |
Beans, Peppers |
Marigolds, tarragon, mints |
|
|
|
Marigolds will deter nematodes. |
|
Leek |
Allium ampeloprasum v. porrum |
Celery, apple trees |
carrots |
|
cabbage worms, aphids, carrot fly, others |
Legumes (beans, peas, etc.), Swiss chard |
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, kohlrabi, 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 |
Common name |
Scientific name |
Helps |
Helped by |
Attracts |
Repels/Distracts |
Avoid |
Comments |
Onion |
Allium cepa |
Tomatoes, brassicas (broccoli, cabbage, etc.) |
Carrots |
|
aphids, carrot fly, other pests |
Beans, lentils, peas, parsley |
Same companion traits as all other alliums (chives, garlic, shallots, leeks, etc.) |
Peppers |
Solanaceae, Capsicum |
themselves, marjoram |
tomatoes, geraniums, petunias |
Tomato Hornworm |
|
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. |
Potato |
Solanum tuberosum |
|
Horseradish |
|
|
Atriplex, carrot, cucumber, onion, raspberries, squash, sunflower, tomato |
Horseradish increases the disease resistance of potatoes |
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. |
Pumpkin and other Squash |
Curcurbita spp |
corn, beans |
Buckwheat, catnip, tansy, radishes |
Spiders, Ground Beetles |
|
|
Radishes can be used as a trap crop against flea beetles, Curcurbita can be used in the three sisters technique |
Radish |
Raphanus sativus |
squash, eggplant, cucumber,[2] lettuce |
|
|
flea beetles, cucumber beetles |
|
Radishes can be used as a trap crop against flea beetles |
Spinach |
Spinacia oleracea |
|
Peas, Beans |
|
|
|
The peas and beans provide natural shade for the spinach |
Tomatoes |
Solanum lycopersicum |
roses, peppers, asparagus |
basil,[3] oregano, parsley, carrots, marigold, Alliums, celery, Geraniums, Petunias, Nasturtium, Borage, any type of onion or chives |
Tomato Hornworm |
asparagus beetle |
Black walnut, corn, fennel, peas, dill, potatoes, beetroot, brassicas (kohlrabi, cabbage, etc.), 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%.[3] |