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Companion Gardening - compatible plants
by Monica Skinner
May 28, 2008

African Marigolds – Discourages pests on fruit trees Counteract nematode damage in roses Plant daffodils where A. Marigolds were planted – repels nematodes

Allium, shallots, leeks, chives - good with Roses. Repels aphids & other pest/mildew/black spot. Repel moles. - Same culture as onions Onion – repels cabbage butterfly Chives – good near tomatoes Garlic – repels borers on fruit trees

Ameranth – brings nutrients from subsoil. Good with potato, onion, corn.

Anise – grows better with coriander

Ants – repelled by spearmint, pennyroyal, southernwood and tansy

Aphids – ladybugs eat aphid. Garlic, chives, allium, coriander, anise, nasturtium, petunia, pennyroyal, southernwood, tansy repel aphids Chives between chrysanthemum, sunflower, tomato discourage aphids

Apple blossom – For scab – chives, water with chive tea. For borers – onion family, garlic, onion spray

Basil – see tomato

Bean – beans thrives with carrots & cauliflower. Also beets. Marigolds help repel Mex. Bean beetle Do NOT like onion family nor gladiolus. Broad beans & corn – beans climb, corn anchor. Potato – beans protect potato against Col. Potato beetle; potato protects bean Against Mex. Bean beetle.

Bush beans – are mutually beneficial with cucumbers and strawberries. An occasional nasturtium Protects from black fly

Pole beans – good with corn & summer savory. Mutual benefit with radishes. Dislikes kohlrabi & sunflower

Bean, scarlet runners – good with savory, strawberries, potatoes, beets, radish. Not onion family.

Beets – dislike pole beans. Like bush beans, onion & kohlrabi. Lettuce and cabbage family OK

Begonia – grows well with gesneriads in pots. Same culture and sun requirements Biological Control – Firefly larvae feed on slugs and snails Ladybugs eat aphids Assassin bugs eat caterpillars, leafhoppers, tree hoppers Robber flies pollinate, larvae eat aphids, leafhoppers, mealy bugs

Black fly – intercrop with garlic to prevent them

Bleeding heart – set another plant close by for later in season e.g. anemone vitifolia

Borage – supplies calcium, potassium & other minerals to soil. Plants in orchards or as border in strawberry beds

Borers – garlic round fruit trees (when trees young and newly planted) Nasturtiums also

Broccoli –use BT for caterpillars. Aromatic plants – dill, rosemary, celery, sage, peppermint Yes – herbs, potatoes, beets, onions. No-tomatoes, pole beans, strawberries Oregano repels cabbage butterfly.

Dwarf or red bud - Flowers attract and kill Japanese beetle

Buttercup family – root secretions poison soil for clover. Family=delphiniums, peonies, monkshood, columbine

Cabbage – thyme, hyssop, wormwood help repels cabbage white butterfly. Helped by aromatic plants Dislike strawberries, tomatoes, pole beans

Canadian fleabane – flowers attract and kill Japanese beetle

Canna – leaves used as greenhouse fumigant for aphids, ant and mice. Put newspaper in pail with grating on top, cover with straw and canna leaves, burn paper. Leaves will scorch and give off smoke. Close door. 30 min.

Carrot – carrot fly repelled by rosemary and sage. Grow well with leaf lettuce & tomatoes. Dislike dill. Chives give carrots better growth and flavour. Repel carrot flies.

Cauliflower – celery repels cabbage white butterfly. Dislikes tomato and strawberries

Celery – grows well with all veggies, esp. leeks, tomatoes, cauliflower, cabbage Mutual benefit with bush beans

Chives – help prevent apple scab. (also see carrots)

Chrysanthemum - Protective to strawberries

Crimson clover – soil improvement, fixed Nitrogen, plow under at end of season Columbine – prefer to be by themselves, attract red spider and hummingbirds. May be detrimental to other plants

Coreospis – insect control for nearby plants

Coriander – repels aphids. Coriander vs. parsley - 4X carotene, 3X calcium, > protein, > minerals, >riboflavin, >vitamin B

Corn – with potatoes, peas, beans, cucumbers, pumpkin, squash. Not tomatoes because the Tomato and corn earworms are the same.

Cucumber – with beans, peas, radishes, sunflower. Sow 2 or 3 radishes in cucumber hill, do not pull, protects against cucumber beetle. Sugar spray will kill nematodes and and attract bees == > pollination. Not potatoes or herbs. Chive spray for downy mildew.

Creeping Jenny – aroma protects nearby plants from insects

Dahlia – protects nearby plants from nematodes

Daisy – increases acidity of soil

Dandelion – does not compete with grass – long tap roots. Transports minerals to surface soil. Stimulates fruits to ripen faster. Gives of ethylene gas =>limits height & growth of neighbouring plants & stimulates flowers & fruit to mature early.

Daphne – poisonous to children

Dill – good companion to cabbage. Dislikes carrots.

Dusty Millar – planted around flowers will repel rabbits and other animals.

Eggplant – plant with beans to repel Col. Potato Beetle

Elder – leaves and branches deter animals and insects

Fennel – has a bad effect on bush beans, kohlrabi and tomatoes. Is inhibited by coriander

Feverfew – works as a big chaser, plant as a border around roses, scatter through garden

Flax – improves growth and flavour of carrots and potatoes. With potatoes offers some protection against Col. Potato beetle

Four O’Clocks – foliage delicious, but poisonous to Japanese beetles (plant poisonous)

Foxglove – stimulating effect on nearby plants. Good companion for pines. Tea in vases prolongs cut flowers. (poisonous)

Frogs – eat many garden pests (up to 10,000 in 3 months of which 16% may be cutworms)

Fruit trees – surround by chives, garlic, onion, nasturtium, stinging nettle.

Garlic – aids fighting black spot in roses. Spray for all plants. – minced garlic water, veg oil, (hot pepper. Esp. for late blight in tomatoes and potatoes. Planted around fruit trees against borers. Good with tomato against red spider. Inhibits growth of peas and beans. (as do all alliums)

Geranium – repels Japanese beetle on roses. Repels cabbage worms. White geranium good with corn.

Geranium, scented – repels mosquitoes if leaves brushed over skin

Gladiolus – disliked by peas and beans & vice versa – inhibits growth

Hawthorne – offers protection due to thorns

Hens and Chicks – Romans thought they would protect houses from lightning if they grew on the roof

Hyssop - planted with cabbage will deter white cabbage butterflies

Japanese Beetle – traps crops include African marigold, evening primrose, woodbine

Kohlrabi – does well with onion, beets, aromatic plants & cucumbers because occupy different Soil strata. Dislikes strawberries, tomatoes & pole beans.

Lamb’s quarters – adds vigour to zinnias, peonies and pansies

Lavender – deters flies

Leafhopper – repelled by petunia and geranium

Leeks – grow well with celery, onion, carrots.

Lettuce – grows well strawberries, cucumber, carrots, radishes.

Lily of the Valley – very poisonous – even water they are standing in can kill a child

Lupin – A legume. Good with all crops, especially corn.

Maple – put leaves between apples and root vegetables for preservative effect Marigold – drives away nematodes. Good with chrysanthemum, calendula, dahlia, potatoes, roses, strawberries - rotate planting of marigolds with crops susceptible to nematode injury - kills nematodes with chemical produced by roots. Produced slowly ==.benefit comes following year or plant thickly. - Sulphur containing substance – thiophenes - tomatoes with marigold grow and produce better - helps protect beans from Mex. Bean beetle

Melon – do not rotate with squash or cuke (all same family) No potatoes. Yes – corn, sunflowers. Morning Glory helps germination

Mexican bean beetle – repelled by marigold, potato, rosemary, summer savory, petunia

Mites – repelled by onions, garlic, chives

Morning Glory – do well with same vine as pole beans

Nasturtium – sow around apple trees in spring to combat woolly aphids (yellow color discourages) Repels cucumbers beetle, keeps squash bugs from squash Keeps aphids off broccoli, benefits potatoes, radishes, curbits and cabbage family In greenhouse repels white flies

Nematodes – repelled by marigolds, salvia, dahlia, calendula, asparagus

Nettles – good in compost pile. Help plants withstand lice, slugs and snails. Strengthen growth of Tomatoes. Increase aromatic quality of herbs. Fruit packed in nettles has less mould and keeps longer. Leguminosae –nitrogen fixing, benefit potatoes, carrots, cukes, cabbage family, turnips, radish herbs, etc. etc.

Onion – grow with cabbage family. Also beets, tomato, lettuce, summer savory. No peas, beans. Scatter onions around garden as onion maggots travel from plant to plant. Repel rabbits.

Pansies – mutually beneficial with rye

Parsley – repels carrot flies, repels rose beetles. Adds vigour to tomatoes and asparagus.

Peas – carrot roots contain an exudates beneficial to peas. Grow well with carrots, turnips, radish, cuke, corn, beans, potatoes, herbs. No – onion, garlic, gladioli

Peppers – pepper juice helps protect plants from viruses transmitted by wind or insect, eg. tobacco mosaic, potato virus, some carried by aphids. Plant hot peppers among flowers to discourage insect pest. Sweet pepper and basil have same requirements.

Petunia – protects beans from Mexican bean beetle

Pine – needs a good mulch for azaleas and rhodos. Needles contain terpene which can inhibit seed germination

Poppy – robs soil of nutrients

Potatoes – not cukes – more likely to get phytophthora blight. Yes – beans, corn, cabbage, marigolds. No – pumpkin, tomato, raspberry, apple trees (potatoes more susceptible to phytophthora blight) squash, cuke, sunflower (stunts its growth) as lower resistance to blight. Bean protect from Colorado Potato Beetle and potatoes protect beans from Mexican Bean Beetle

Primrose – grows well with candytuft, pansies, calendula, violas

Pumpkin – pumpkin and potatoes inhibit one another

Purslane – a weed – will survive the composting process

Radish – dislike hyssop. With lettuce are very succulent. Good with beets, spinach, carrots, parsnips No – hyssop.

Rabbits – dislike onion family

Raspberry – keep red and black apart – mild disease in red can be fatal for black. May make Potatoes more susceptible to blight.

Redbud – member of the bean family – nitrogen fixing

Rhubarb – juice from boiled rhubarb sprayed on roses may protect against greenfly and black spot

Rose chafer – repelled by geranium, petunia and onion family

Roses – dislike boxwood (roots interfere) Garlic and onions (alliums) help against black spot, mildew and aphids. Especially onions and garlic. Parsley repels rose beetles. Onions repel rose chafers. Marigolds repel nematodes. Nasturtiums repel Japanese beetle. Infusion of elderberry leaves sprayed on may help control caterpillars and blight.

Sage – protects the cabbage family from white cabbage butterfly. Makes cabbage more succulent and tasty. Protects carrots from carrot fly. No – cukes do not like it.

Sedum – trouble free

Shoofly plant – repels whiteflies

Spinach –does well with strawberries

Squash – icicle radishes prevent insects

Strawberries – onions are protective. Lettuce makes a good border. Pyrethrum serves as pest preventative. Does well with Bush beans, spinach, borage; white hellebore controls sawfly. Marigolds control nematodes. Pine needle mulch improves taste.

Sugar – 5 lbs sugar per 100 lbs soil will kill nematodes within 24 hours

Sumac – bury sumac leaves around apple trees to deter wools aphids

Tansy – oil repels flies and mosquitoes as well as ants.

Tomato – tomato hookworm repelled by borage, marigold and opal basil. Basil helps overcome disease and insects, also improves growth and flavour. Monarda improves growth & flavour of tomatoes. No – brassica family. Yes – chives, onion, parsley, marigold, nasturtium, carrot. Garlic protects them from red spider mites. Tomatoes make potatoes more susceptible to blight

Tulip – scilla bulbs help protect against mice

White fly – repelled by nasturtium and marigold

Yarrow – gives nearby plants resistance to insects and adverse conditions

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