Juncus effusus 'Unicorn' or Unicorn Soft Rush is a fairly new evergreen, perennial, hybrid rush developed by the University of British Columbia Botanical Gardens. Plants have unique spiral blades that reach up to 18 inches (45 cm) tall by 0.25 inches (4 mm) wide, with clumps up to 24 inches (60 cm) wide. The plants spread by underground rhizomes. They are very easy to culture in containers and make a wonderful addition to the water garden. They are hardy in USDA zones 4-9.
Blooming: In the greenhouse, the rush blooms in the summer with small insignificant brownish flowers.
Culture: Juncus effusus 'Unicorn' need full sun to light shade, with a rich moist soil mix. In the greenhouse, we use a soil mix consisting of 2 parts peat moss to 2 parts loam to 1 part sand or perlite. The plants are kept moist at all times and fertilized on a monthly basis with a balanced fertilizer diluted to ˝ the strength recommended on the label. Plants in containers can be immersed in water up to 4 inches (10 cm) deep. When used in the landscape, the plants are slow getting established, but once established the plants are fairly fast growing. In the winter months, we keep container grown plants in the greenhouse at a temperature of 55°F (13°C); plants are never allowed to dry thoroughly.
Propagation: Juncus effusus 'Unicorn' is propagated from division and from seed when available.
Juncus effusus 'Unicorn' was featured as Plant of the Week November 4-10, 2005.
Guide to Past Plants-of-the-Week:
Cal's Plant of the Week was provided as a service by the University of Oklahoma Department of Microbiology & Plant Biology and specifically the late Cal Lemke, who used to be OU's botany greenhouse grower and an avid gardener at home as well. If the above links don't work, then try the overview site. You may also like to look at the thumbnail index. ©1998-2012 All rights reserved.