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This is an incomplete list, which may never be able to satisfy certain standards for completeness. Revisions and sourced additions are welcome.

This is a list of companion plant relationships. Many more are in list of beneficial weeds.

Contents 1 Temperate companion plants 1.1 Vegetables 1.1.1 Beans 1.1.2 Cabbage 1.1.3 Carrots 1.1.4 Corn (Maize) 1.1.5 Fennel 1.1.6 Leek 1.1.7 Lettuce 1.1.8 Mustard 1.1.9 Peppers 1.1.10 Onion 1.1.11 Potato 1.1.12 Tomato 1.2 Herbs 1.2.1 Alliums (onion, garlic, chives, et cetera) 1.2.1.1 avoid 1.2.2 Basil 1.2.2.1 avoid 1.2.3 Borage 1.2.4 Chervil 1.2.5 Dill 1.2.5.1 avoid 1.2.6 Garlic 1.2.7 German Chamomile 1.2.8 Hemp 1.2.9 Hyssop 1.2.10 Patchouli 1.2.11 Peppermint 1.2.12 Rosemary 1.2.13 Savory 1.2.14 Southernwood 1.2.15 Tansy 1.2.16 Valerian 1.2.17 Yarrow 1.3 Flowers 1.3.1 Geraniums 1.3.2 Marigold 1.3.3 Nasturtium 1.3.4 Tagetes 1.4 Trees 1.4.1 Apple 1.4.2 Walnut 1.4.2.1 avoid 2 Tropical companion plants 2.1 References 3 See also

Beneficial

• Carrots, and Cauliflowers thrive in conjunction with beans
• Spinach benefits from the bean plant's tendency to improve soil nitrogen, and from the partial shade the plant provides.
• Eggplant is protected from California beetles by bean plants.
• corn benefits by bean plants vining directly up their stalks. This fixes nitrogen for them, anchors the stalk to make it stronger, and can even deter raccoons in their quest for the ears of corn.
• rosemary repels several parasitic insects, and likes the same dry, sandy soil.
• summer savory

Avoid

• Chives, kohlrabi, sunflower, onions, garlic, leeks, peas and other alliums are said to inhibit the growth of beans.

Beneficial

• Rosemary repels cabbage flies

Avoid

• Mustard-species
• Onion

Beneficial

• Onions are said to flourish with carrots
• Lettuce, and Chives?? combine with carrots too
• Tomatoes seem to grow faster and fruit more with carrots around; but may actually be drawing the nourishment from the carrots, which can end up growing much more slowly than normal.
• Onions, leeks and herbs such as rosemary, wormwood, and sage act as repellents to the carrot fly.

Avoid

• Dill
• Parsnip
• Radish

Beneficial

• Beans benefit corn by vining directly up their stalks. This fixes nitrogen for them, anchors the stalk to make it stronger, and can even deter raccoons in their quest for the ears of corn.
• Sunflowers have been planted between stalks or rows of corn for as many as a thousand years. Said to increase yields. Draws away aphids. DO NOT plant with beans!
• Squash protects the soil around the corn from weeds, and reduces water loss. Corn, beans, and squash are known together as the Three Sisters method of agriculture, which like sunflower/corn was in use by American Indians before modern Europeans settled the Americas.
• Cucumbers provide ground cover and partially support corn stalks.
• Peanuts encourage growth of both corn and squash, and provides ground cover.
• Soybeans fix nitrogen in the soil, provide cover, and repel cinch bugs and Japanese beetles.
• Amaranth yet another classic Amerindian companion crop, provides ground cover, grows tall enough to shade the ears of corn, purportedly making them sweeter, and hosts predatory beetles which help keep parasitic insects down.

Avoid

• Tomato

Beneficial

• lettuce and Leek

Avoid

• Retarded seed procurement of the fennel when placed next to Coriander
• tomato
• Kohlrabi
• beans

Beneficial

• Combines with Celery, apple trees

Beneficial

• Combines well with Radish and Kohlrabi

Beneficial

• Cabbage, cauliflower, radish, brussels sprouts, and turnips all benefit from mustard attracting pests away from them

Beneficial

• Themselves -- Because pepper plants need direct sunlight, but the fruit can be damaged by it, they are often planted very closely together, so that their upper leaves will shelter each other's fruit along the body of the plant.
• Tomato plants, similarly, are good for sheltering peppers. Both also grow in the same kind of acidic soil.
• Marjoram is said to enhance the flavor of peppers, as well as keeping some insects away because of its scent.

Beneficial

• Tomatoes benefit from the onion repelling aphids

Avoid

• Common bean
• Cabbage-species
• Peas
• Parsnip
• Parsley
• Leeks

Beneficial

• Horseradish increases their resistance to disease

Avoid

• Sunflower

Beneficial

• Basil is supposed to enhance the flavor of tomato fruit, as well as more definitely deterring certain insects (especially aphids and hornworms) because of its scent.
• Oregano has the same benefits as basil.
• Chili peppers, including bell peppers, benefit from the partial shade when planted very close to tomato plants. The pepper plants do need direct sunlight, but their fruit can suffer "blossom-end rot" from too much direct sunlight, so the spreading tomato plants may shade the fruit without blocking the topmost leaves.
• Parsley
• Carrots
• Marigolds attract hover flies, which eat the aphids which are a threat to tomato plants.
• Roses are ostensibly protected from black spot by tomato plants
• Chives repel several types of insect pests, as do its relatives, including onions and garlic.
• Celery is said to improve growth.

Avoid

• 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.
• corn
• Fennel
• Peas
• Dill
• Potatoes
• Beetroot
• Kohlrabi
• Brussel Sprouts
• Cauliflower
• Rosemary
• Nasturtium

• Repels many insects, especially useful for tomatoes and peppers

• Beans hate alliums

• Tomato provides shade for the basil, while the basil repels some pest insects and may improve flavor
• Pepper may have its flavor improved by basil
• Asparagus has pest insects repelled by basil
• Petunias

• Common Rue

• Combines with strawberry, cucumber, tomato

• Radish

• with cabbage and corn

• carrots
• Tomato

• Protects apple and pear- trees, as well as cucumber, peas, lettuce, and Celery, shunts rabbits

• wheat
• onions
• cabbage

• Repels a number of parasitic beetle larvae which attack cabbage, broccoli, and their relatives

• Repels cabbage flies from cabbage, stimulates growth of grapes

• Repels some insects

• protects cabbage-species against cabbage flies

• sage, shunts cabbage flies
• cabbage; repels several pests
• beans; repels several of its parasites
• carrots

• Common bean
• onions
• Satureja hortensis, also delays germination of certain foul herbs

• For use with all kind of fruit-trees

• With peach trees

• Protects all kinds of vegetables

• With most plants

• attract pests away from roses and grape vines

• Improves growth of tomato, repels parasitic flies

• keeps apple-trees and broccoli free from Aphids, good next to Radish, protects cucumber and beans

• Certain Varieties of marigolds (tagetes) can help manage eelworms (Root-knot nematode) when planted the year before[1].
• Repels cabbage flies from cabbage, protects cucumber

• Leek
• Garlic
• Nasturtium
• Southernwood

• 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, tobacco, tomato, and petunia.

none as of yet

• The Rodale Herb Book, Eighth Printing, c1974, ISBN: 0-87857-076-4
• Companion Planting Guide, Ute Bohnsack [2]
• Companion Planting
• Companion plants by Professor Stuart B. Hill Department of Entomology Macdonald College
• DGS Gardening companion plant list
• Companion plant compatibility grid
• carrots love tomatoes

List of beneficial weeds

List of repellant plants

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