Here is a list of plants and what insects they repel. This was sent in by Gill, a long time reader.
|INSECT PEST||REPELLING PLANT|
|Ants||pennyroyal, spearmint, southernwood, tansy|
|Aphids||garlic, chives and other alliums, coriander, anise, nasturtium and petunia around fruit trees|
|Borer||garlic, onion, tansy|
|Cabbage moth||mint, hyssop, rosemary, southernwood, thyme, sage, wormwood, celery, catnip, nasturtium|
|Colorado potato beetle||green beans, horseradish, dead nettle, flax, catnip, coriander, tansy, nasturtium|
|Cucumber beetle||tansy, radish|
|Flea beetle||wormwood, mint, catnip, interplant cole crops with tomato|
|Japanese beetle||garlic, larkspur, tansy, rue, white geranium|
|Mexican bean beetle||marigold, potato, rosemary, savory, petunia|
|Mites||onion, garlic, chives|
|Nematodes||marigold, salvia, dahlia, calendula, asparagus|
|Rose chafer||geranium, petunia, onion|
|Slug||prostrate rosemary, wormwood|
|Squash bug||tansy, nasturtium, catnip|
|Tomato hornworm||borage, marigold, opal basal|
In my experience in So Cal, rather than repelling aphids nasturiums are the first plant (other than impatiens) to be taken over by the aphids.
That's the point, they are a sacrificial plant.
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