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Herbs work especially well as companion plants. They multitask by attracting beneficial insects and repelling pest insects and their fragrance and foliage make them good companions in both the vegetable garden and the ornamental border. The following list is compiled from experience and other people’s suggestions. Keep in mind that some things work in conjunction with other factors in the environment and your results might not be the same as mine. However with some tweaking here and there, you should be able to use plants to keep a better balance in your gardens.

Using Herbs As Companion Plants to Deter Pests
Aphids - Chives, Coriander, Nasturtium
Ants - Tansy
Asparagus Beetle - Pot Marigold
Bean Beetle - Marigold, Nasturtium, Rosemary
Cabbage Moth - Hyssop, Mint (also clothes moths), Oregano, Rosemary, Sage, Southernwood, Tansy, Thyme
Carrot Fly - Rosemary, Sage
Flea Beetle - Catmint (Contains nepetalactone, an insect repellent. Steep in water and spray on plants.), Mint
Flies - Basil, Rue
Fruit Tree Moths - Southernwood
Japanese Beetles - Garlic & Rue (When used near roses and raspberries), Tansy
Potato Bugs - Horseradish
Mosquitoes - Basil, Rosemary
Moths - Santolina
Nematodes - Marigold (Marigolds should be established for at least 1 year before their nematode deterring properties will take effect.)
Savory, Winter - Some insect repelling qualities
Squash Bugs & Beetles - Nasturtium, Tansy
Ticks - Lavender (Also thought to repel mice and moths.)Continue