Chives are perennial. They will grow in clumps, with small bulbs at the bases of each leaf set, and these bulbs are attached by a rhizomatous root that spreads very slowly, horizontally beneath the surface of the soil. Chives are hardy to Zone 3, but will die back in harsh winters, emerging in the spring. In south coastal B.C., they may be harvested all winter long in sheltered areas. Sow chive seeds at nearly at time of year.