You can harvest chives once they're about 6 inches tall. You can harvest chives more than once, and herbs in their first year ...

Pulled plants won't regrow, however, this is a practical way to thin out overgrown clumps. You can cut an entire clump of chives at once or take several stems at a time as needed. Follow these ...

As long as the seeds are not sewn too closely in the first place, they will need no thinning out. You can get chive seeds ...