Thursday, December 31, 2009
Botanical name: Rudbeckia amplexicaulis (Asteraceae)
A hardy annual native to the southeastern United States, and has naturalized throughout most of North America. The identifiable black, cone-shaped heads are surrounded by bright yellow, drooping reflexed ray flowers. This drought tolerant annual is quick growing, with masses of 'Mexican hat' blooms all summer, aloft blue-green foliage. Grow in wide drifts to create a natural 'prairie' effect in the garden. A very heavy reseeder. Another wonderful variety for cut arrangements.
How to grow
It is adapted to many soil types, but clasping coneflower generally prefers a moist site. Natural stands are usually found on bottomland areas with a fairly rich soil and ample moisture. It prefers full sun and will not persist in a shaded location.
Height: 1 1/2-2 feet
Germination: 7-30 days
Optimum soil temperature for germination: 70F
Sowing depth: 1/16"
Blooming period: June-September
USDA Zone: 6-10