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Companion Plants

Companion plants are beneficial to cropping plants by deterring or displacing pests
Nasturtiums
Benefits many plants, especially cucurbits (melons, cucumbers, gourds), beans, tomatoes, apple trees, brassicas (broccoli, cabbage, etc), radish
Deters aphids, cabbage looper, squash bug, white fly, cucumber beetles
Marigolds
Benefits most plants, especially tomatoes and peppers, cucurbits (cucumbers, gourds, squash), brassicas (broccoli, kale, cabbage)
Deters nematodes, beet leaf hoppers, other pests. Chemical from roots remains in soil for some time.
Rosemary
Helps sage, cabbage, beans, carrots
Deters cabbage flies, repels many bean parasites
Garlic or onions
Helps Apple trees, Pear trees, Roses, Cucumbers, Peas, Lettuce, Celery
Deters Slugs, Aphids, cabbage looper, ants, rabbits, cabbage root fly
And many more – http://en.wikipedia.org/wiki/List_of_companion_plants