In the book "Roses Love Garlic, secrets of companion planting with flowers" by Louise Riotte, put out by Garden Way Publishing it says,
"Roses do not like boxwood because its outspreading, woody roots interfere with the roots of rose bushes. But garlic, onions, and other members of the onion family, including ornamental alliums, are beneficial."
Chives, especially garlic chives, are excellent companion plants for roses. They attract aphids away from the roses (making them easier to get rid of), and also they seem to improve the perfume of the roses.
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