These
plants are thought to repel specific pests; plant them near crops where these pests are a common problem:
Anise planted among members of the cabbage family (cabbage, broccoli, cauliflower, kale, and so on) is said to repel imported cabbage worms.
Basil is said to repel whiteflies, aphids, and spider mites; it's a good companion to tomatoes because these are insects that feed on tomato plants.
Catnip is said to repel some types of aphids, flea beetles, squash bugs, and cucumber beetles.
Garlic may repel nematodes and other soil insects.
Leeks are thought to repel carrot flies.
Marigolds planted around vegetables are said to repel root nematodes, Mexican bean beetles, and Colorado potato beetles.
Mustard greens are supposed to repel aphids.
Nasturtiums are said to repel Colorado potato beetles.
Radishes may repel striped cucumber beetles.
Ryegrass may repel root-knot nematodes.
Southernwood may repel moths and flea beetles.
Tansy is supposed to repel some aphids, squash bugs, and Colorado potato beetles as well as ants.
White clover may repel cabbage root flies.
Wormwood may repel flea beetles.
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