Clumps of chives spread to about 30cm (12″) across. They should be divided at that point and replanted to stand 30cm (12″) apart or broken up for container planting. Remove flower stems before they open to increase foliage production. Keep chives watered evenly throughout the season. For a winter crop, try digging up a small clump after the foliage dies back in the fall. Plant this in a container using loamy potting mix, and bring indoors to a warm, and very bright windowsill.