My mother always plants chive plants with her roses. “They keep away the aphids and prevent black spot,” she always tells me. It seems to be true because I have never seen a single aphid or black spot on any of her roses.
Chives are also good for making chive vinegar. For the vinegar you need: about 20 chive blossoms, white wine (or champagne) vinegar and a bottle to keep it in.
Place the chive blossoms in the bottle (the blossoms do not need to be packed tightly).
Cover and let it steep in a dark cupboard for about a week. The blossoms will tint the vinegar pink and leave you with a STRONG chive vinegar.