Blue Spreading Rush Juncus patens This water plant forms dense clumps of upright spiky foliage. The slate blue-green leaves add color contrast to the pond. Golden-brown seed tufts appear in summer. Plants should be kept constantly moist. Height: 12-24. Spacing: one per square foot. Light: Full sun. Soil: wet boggy soil. Water Depth: 1-3" over the top of the pot. Bloom time: summer.  Hardy zones 4-10. Corkscrew Rush (Water Sedge) Juncus effusus 'Spiralis' This hardy bog plant has very unusual grass-like, wiry, twisted stems and cymes of small brown-green flowers. Very effective when grown in containers and excellent in dried floral arrangement. Light: Full sun to partial shade. Height: grows 8" tall. Water Depth: 1-2." Blooms: In summer. Grows well at water's edge or in bog gardens. Handiness: Zone 6 to 10.