Plant Companions and Uses

Anise- coriander.
Basil- tomato; dislikes rue; repels flies and mosquitoes.
Borage- tomato, squash.
Buttercup- clover; hinders delphinium, peony, monkshood, columbine.
Chamomile- helps peppermint, wheat, onions, and cabbage; large amounts destructive.
Catnip- repels flea beetles.
Chervil- radish.
Chives- carrot; prone to apple scab and powdery mildew.
Coriander- hinders seed formation in fennel.
Cosmos- repels corn earworms
Dill- cabbage; hinders carrot and tomato.
Fennel- disliked by all garden vegetables.
Garlic- aids vetch and roses; hinders peas and beans.
Hemp- beneficial as a neighbor to most plants.
Horseradish- repels potato bugs.
Horsetail- makes fungicide spray.
Hyssop- attracts cabbage fly away from cabbages; harmful to radishes.
Lovage- improves hardiness and flavor of neighbor plants.
Marigold- pest repellent; use against Mexican bean beetles and nematodes.
Mint- repels ants, flea beetles, and cabbage worm butterflies.
Morning glory- corn; helps melon germination.
Nasturtium- cabbage, cucumbers; deters aphids, squash bugs, and pumpkin beetles.
Nettle- increases oil content in neighbors.
Parsley- tomatoes, asparagus.
Purslane- good ground cover.
Rosemary- repels cabbage moths, bean beetles, and carrot flies.
Sage- repels cabbage moths and carrot flies.
Savory- deters bean beetles.
Sunflower- hinders potatoes; improves soil.
Tansy- deters Japanese beetles, striped cucumber beetles, and squash bugs.
Thyme- repels cabbage worms.
Yarrow- increases essential oils of neighbors.