I do not vouch for any or all of these bits of garden pest protection lore but pass them along to you to try. I do know many gardeners who swear by any and all of these companion planting techniques to protect your garden from pest problems.

Please understand the effects of each of these garden pest protection plants is very localized (i.e. small area) so if you want to stop ants for example from putting aphids on a tree, you’ll have to surround the tree with petunias. A petunia located a few yards away is ineffective. A bit of pennyroyal in one part of the garden will not deter pests from entering another. Chives in the herb garden may protect those plants next door but not a yard away. The companion plants have to be companions �?kissing cousins so to speak - to be effective.

If you want to get garden pest protection - then plant:

Ants (carrying aphids) then plant pennyroyal, spearmint, southernwood, tansy,

Aphids plant pennyroyal, spearmint, southernwood, tansy, garlic, chives, coriander, anise, nasturtiums and petunias.

Asparagus beetles apparently do not like tomatoes

Borers dislike garlic, tansy, and onion

Cabbage maggots are stopped if you plant alternating rows of mint, tomato, rosemary, sage.

Cabbage moths apparently do not like mint, hyssop, rosemary, southernwood, thyme, sage, wormwood, celery, catnip and nasturtiums.

Carrot Fly dislikes rosemary, sage, wormwood, salsify, onions, coriander

Chinch bugs don’t like soy beans so surround your lawn with them. Right.

Colorado Potato Beetle doesn’t like green beans (me neither), horseradish, dead nettle and flax.

Cucumber Beetle is repelled by radish and tansy

Cutworms  are driven to distraction by tansy

Eelworms  are repelled by big stinky marigolds

Flea beetle  wormwood, mint, catnip, tomatoes

Fruit tree moths of all sorts  don’t like southernwood

Groundhogs  castor beans and human urine although the latter is enhanced by imbibing products made from hops

Japanese Beetles  garlic, larkspur/delphiniums, tansy, rue, geraniums

Leafhopper  petunias and geraniums

Mexican bean beetle  marigold, potatoes, rosemary, summer savory, and petunias

Mice  don’t like mint (mice hate fresh breath)

Mites  are repelled by onion, garlic and chives

Moles  don’t like spurge, castor plants and castor oil, fritillaria bulbs

Nematodes  stinky marigolds, salvia, dahlia, calendula, asparagus

Plum curculio  are supposedly repelled by garlic �?don’t ask me how you get it into the tree but I’ve read this more than once. (maybe all copying from one source)

Rabbits  don’t like onions or the onion family (garlic/chives etc)

Rose chafer  geraniums, petunia and onion family

Slugs  don’t like rosemary, wormwood and that might be the only two plants they wont�?eat

Squash bug  don’t like tansy and nasturtiums

Pumpkin beetle  doesn’t like nasturtiums (and nasturtiums don’t like it either)

Tomato hornworm  is deterred by borage, marigolds and basil.

White fly  won’t go near nasturtiums, marigolds, nicandra

Wireworms  apparently don’t like mustard and buckwheat.

And when it comes to garden pest protection, that’s the best I can do for you at the moment. There’s all kinds of other solutions out there but these are the standards.