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Companion Plants that Repel Pests

Source: University of Rhode Island (https://web.uri.edu/mastergardener/files/J4-Companion-Planting-Pests-and-Plants-That-Repel-Them.pdf) and various. Note that Tansy is considered invasive in some areas.

Insect or Mammal Pest Repellent Plants
Ants Catnip, Chrysanthemums, Mints, Mugwort, Sagebrush, Spearmint, Tansy, Wormwood
Aphids Catnip, Chives, Clover, Coriander, Dill, Eucalyptus, Fennel, Garlic, Larkspur, Marigold, Mustard, Nasturtium, Peppermint, Petunias, Spearmint
Asparagus Beetles Basil, Calendula, Nasturtium, Parsley, Petunia, Spearmint, Tansy, Tomato
Cabbage Butterflies Dill, Geranium, Hyssop, Southernwood, Tansy
Cabbage Loopers Catnip, Dill, Eucalyptus, Garlic, Hyssop, Mugwort, Nasturtium, Onion, Pennyroyal, Peppermint, Rosemary, Sage, Sagebrush, Southernwood, Spearmint, Thyme, Wormwood
Cabbage Maggots Garlic, Marigold, Mugwort, Radish, Sage, Sagebrush, Tansy, Thyme, Wormwood
Cabbage Moths Sage, Lavender, Onion, Peppermint, Tansy
Cabbage Worms Borage
Carrot Flies Basil, Chives, Leek, Lettuce, Mugwort, Nasturtium, Onion, Rosemary, Sage, Sagebrush, Tansy, Tobacco, Wormwood
Codling Moth Garlic, Lavender, Mugwort, Sagebrush, Wormwood
Colorado Potato Beetle Catnip, Coriander, Eucalyptus, Marigold, Nasturtium, Onion, Tansy
Corn Earworm Cosmos, Geranium, Marigold, Thyme
Cucumber Beetle Catnip, Corn, Marigold, Nasturtium, Radish, Rue, Spearmint, Tansy
Cutworm Spiny Amaranth, Tansy
Flea Beetle Catnip, Marigold, Mugwort, Nasturtium, Peppermint, Rue, Sagebrush, Spearmint, Southernwood, Tansy, Tobacco, Wormwood
Flies Basil, Tansy
Hornworm Borage
Imported Cabbageworm Dill, Garlic, Geranium, Hyssop, Peppermint, Nasturtium, Onion, Pennyroyal, Sage, Southernwood, Tansy, Thyme, Borage
Japanese Beetle Catnip, Chives, Chrysanthemums, Four O’ Clocks, Garlic, Nasturtium, Odorless Marigold, Tansy, White Geranium, Four O’ Clocks
Leafhopper Geranium, Petunia
Mexican Bean Beetle Garlic, Marigold, Nasturtium, Rosemary, Savories
Mouse Wormwood
Mole Castor Bean, Narcissus
Mosquito Basil, Fever Tea, Lantana, Lavender, Lemon Balm, Lemongrass, Lemon Thyme, Lime Basil, Rosemary
Nematodes Calendula, Chrysanthemums, French Marigold, Dahlias, Chrysanthemums
Peach Borer Garlic
Most pests Oregano, Lavender
Rabbit Garlic, Marigold, Onion
Root Maggot Garlic
Slug and Snail Fennel, Garlic, Rosemary
Spider Mite Coriander, Dill
Squash Bug Catnip, Dill, Marigold, Nasturtium, Peppermint, Petunia, Radish, Spearmint, Tansy
Squash Vine Borer Radish
Tomato Hornworm Basil, Borage, Calendula, Dill, Petunias, Thyme
Whitefly Basil, French Marigold, Mugwort, Nasturtium, Peppermint, Sagebrush, Thyme, Wormwood
Wireworm Clover