These look and grow almost identical to onion chives. There are a couple of differences, though. For one, the garlic chives are blooming now, and the onion chives bloomed over a month ago. Another difference that can be seen year round, is that garlic chive spears are flat, where the onion chives are tubular or round.
And then there is the taste. Ah, now there they do differ. The taste and smell of garlic chives is distinct and will never be confused with onion chives.
These are a nice addition to the kitchen garden. I also plant them around my roses to help deter aphids.