tons of plants can affect the plants around them in about a bazillion different ways. i have a book that tells you all the different things they do. and yes garlic keep pests away, same with marigold, and a bunch of other plants as well. it also said that yarrow can increase the essential iol production and fragrance or nearby plants, but i think mostly this kind of stuff works with the plants all in the same soil.

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Hey Uncle Sam,
I am not a pot grower, i just think the girls look pretty... and smell good