Hardiness: Zone 5. Height: 3 ft. Spread: 2 ft. Type: herbaceous perennial. Flowers: Pink. Comments: Flowering Rush is an aquatic plant that can be used in wet areas. It can be planted at the margins of ponds or grow in shallow water up to a foot deep. The leaves have sharp edges and will grow 3 feet tall. The pink flowers are borne in round open clusters, which are carried above the leaves. Red anthers contrast with the pink sepals. Propagation: Seed or by division.