Companions in the garden Asparagus: parsley and tomato--avoid with onion Bean: anything but onion Beet: cabbage, kohlrabi--avoid with runner bean Broccoli: bean, celery, dill--avoid with lettuce, strawberry, tomato Brussels sprouts: hyssop, mint sage, rosemary--avoid strawberry Cabbage: bean, beet, celery, dill--avoid grape, strawberry , tomato Carrot: bean, leek, onion, pea--avoid dill Cauliflower: bean, beet, celery, mint--avoid strawberry, tomato Celery: bean, cabbage, leek, onion, tomato Corn: morning glory, bean, lupine, melon, pea, squash Cucumber: bean, broccoli, celery, radish, pea, lettuce--avoid rue and sage Eggplant: pea, tarragon, thyme Horseradish: potato Kohlrabi: beet, onion--avoid with beans and peppers Leek: carrot, celery--avoid broad bean, broccoli Lettuce: beet, cabbage, pea, radish, strawberry Melon: corn, peanut, sunflower Onion: beet, cabbage, carrot, lettuce, strawberry--avoid peas and beans African Marigold (tagetes erecta) reduces nematodes Anise (Pimpinella anisum) deters aphids, fleas, cabbage worms Basil (Ocimum basilicum) variety of pests Bean (Phaseolus) reduces corn armyworms Borage (Borage officinalis) Japanese beetles, tomato hornworms Broccoli (Brassica oleacea) reduces striped cucumber beetles Carrot (Daucus carota) deters onion flies Catnip (Nepeta cataria) deters ants, aphids and many more Celery (Apium graveolens) deters cabbage butterflies Chive (Allium schoenoprassum) black spot on roses, fruit tree insect Coriander (Coriandrum sativum) deters Colorado beetles Corn (Zea mays) reduces striped cucumber beetle Dandelion (Taraxacum officinale) repels Colorado beetles Dill (Anthum graveolens) repels aphids and spider mites Eucalyptus in general an insect repellent Fennel (Foeniculum vulgare)deters aphids French Marigold (Tagetes patula) deters Mexican bean beetles;nematodes. Garlic (Allium sativum) Japanese beetle; in general an insect repellent Hyssop (Hyssopus officinalis) repels flea beetles, insect larvae Lavender Cotton (Santolina charmaecyparissus) deters corn wireworms, southern root worm Leek (Allium ampeloprasum) deters carrot flies Marigold (Tagetes) deters nematodes, cabbage pests Milkweed (Asclepias) deters aphids/ attracts butterflies Mustard (Brassica nigra) reduces aphids Nasturtium (Tropaeolum majus) A trap crop for aphids Onion (Allium cepa) deters Colorado beetles, carrot fly Petunia squash and potato bug; bean beetle Pot Marigold (Calendula officinalis) asparagus beetle, tomato hornworm. Potato (Solanum tuberosum) deters Mexican bean beetles, Radish (Raphanus sativus) cucumber beetle, root fly, many others. Rue (Ruta graveolens) deters beetles and fleas Rosemary (Rosemarinus officinalis) bean beetle, cabbage moth andothers. Sage (Salvia officinalis) cabbage worm, cabbage moth, root maggot. Savory (Satureja) deters Mexican bean beetles Southernwood (Artemesia abrotanum) deters cabbage moth, carrot flies Soybean ((Glycine max) deters corn earworm, corn borers Tansy (Tanecetum vulgare)ants, aphids, beetles, cabbage worm. Thyme (Thymus vulgaris) cabbage pests and whitefly Tomato (Lycoperiscon lycoperiscum) loppers, flea beetles, white fly on cabbage Wormwood (Artemisia) rodents, slug, snail and many more.