From the Internet, Magazines and Books.
Ever tried any of these?
Garlic discourages Aphids among Rose Bushes.
Garlic curshed into water and sprayed on the Aphids will remove them.
Garlic planted under Peach Trees deter borers.
Aphids are a food source for Ants, they secret a sugary substance that Ants love. Ants protect Aphids from predators and will move the Aphids from plant to plant.
Get rid of the Aphids and the Ants will leave.
Ants DO help the garden some. Aerate the soil, they eat bad bugs, (good ones too) and even spread seed, which we always blame on the birds.

Nasturtiums ward off Cucumber Beetle and Squash Vine Borers.

Marigold scent keeps Rabbits away. French Marigolds have a toxic substance released in the soil that kills nematodes.

4 O'clocks near Roses deter Japanese Beetles, they are toxic to the Beetle.
Basil with Tomato will get rid of Hornworm.
Thyme and Lavender will keep slugs away.
Native Americans were masters at Companion Planting. "Three Sisters Garden"
Corn, Beans and Squash or Pumpkins planted together.
Squash grew at the roots of the corn keeping weeds from interfering and the Beans would grow up the Cornstalk protecting from wind. First Vertical Garden.
What tips do you have for Companion Planting and does it really work? I'm going to try a few.
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Today I am Thankful for the Pioneer Gardeners.