House leeks usually have thick fleshy leaves arranged in a dense rosette. Small plant lets, or offsets, arise in a cluster around the parent plant. Each rosette is monocarpic, meaning that the rosette dies after flowering, though the clonal offsets will persist. The white, pink, or purple flowers are borne in terminal clusters and produce ellipsoid seeds. Like other plants in the family Crassulaceae, house leeks use a specialised system of photosynthesis known as Crassulacean acid metabolism (CAM).