One of the lowest-maintenance crops in the garden: tuck cloves into the ground and let winter do the work of triggering bulb formation. Hardneck types bring bonus curly scapes in late spring, softnecks store the longest. The one rule: plant good stock, not shop-bought bulbs, to avoid disease.
Garlic's sulphur compounds help repel aphids and root maggots from nearby carrots and roses.