Agrimonia pilosa is an erect perennial herb native to Northern Asia and Eastern Europe. The plant has dark green odd pinnate leaves with 7-13 leaflets, which are interspersed with several minor leaflets characteristic of Agrimonia. Each leaflet has 3-7 teeth on each side and is cuneate at the base. In nature, the plant can reach up to 5 feet (1.5 m) tall. Plants in containers are much smaller, usually reaching 2-3 feet (0.6-0.9 m) tall. Agrimonias have medicinal properties and have been used as mouthwashes for sore throats; its astringent properties have been prescribed for internal bleeding. We have been growing these plants for the research of Ms. Kyong-Sook Chung. We have almost all the species growing as research plants in the greenhouse. The plants are easy to grow and are hardy in the landscape in USDA zone 7-10.
Blooming: In the greenhouse, this species blooms in July-August. The very small yellow flowers have 5 egg-shaped petals, slightly notched at the ends and 3/8 inch (1 cm) across. The flowers are closely set on a tall spike. Actually they are quite showy when in bloom. The fruit is a small bristly bur.
Culture: Agrimonia pilosa needs partial shade to full shade with a rich soil mix. In the greenhouse, we use a soil mix consisting of 2 parts peat moss to 1 part loam to 1 part sand or perlite. Plants are very drought tolerant in nature, but not as drought tolerant in containers. We water the plants and they are allowed to dry slightly before watering again. During the growing season, we fertilize them monthly with a balanced fertilizer. In late fall after flowering and fruit set, we move the plants to the cool rooms for winter dormancy. Nighttime temperature never falls below 48°F (9°C). During this period, water is somewhat restricted, but soil is never allowed to dry out thoroughly.
Propagation: Agrimonia pilosa is propagated by division in spring and from seed.
Agrimonia pilosa was featured as Plant of the Week August 31-September 6, 2007.
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.