E. koreanum (Cc. 970079)
Professor Stearn recognized this plant as a distinct species in his 2002 monograph. The staff at the Chollipo Arboretum in S. Korea generously shared a few clones. The species is reportedly quite common in N. Korea and we have additional clones from multiple sites in N.E. China which is the northernmost range of the species. Quite hardy, probably to USDA Zone 3, this deciduous species is usually the first to drop its leaves, shortly after the first killing frost. Each leaf is composed of 9-15 huge, rounded lime green leaflets circumscribed with a thin red line in spring. Three to seven huge, light yellow flowers are pro
duced on each stem beneath unfurling leaves in spring. Once established, it spreads vigorously by 6-12” rhi zomes to form a large colony. An excellent bold-foliaged plant at 15-18” tall. Emerges and blooms later than most Epimediums. Not available in 2018.
Epimedium koreanum ‘Harold Epstein’ (Cc. 930004)
A very cold hardy clone with huge flowers for an Epimedium— gorgeous and butter yellow. Named in honor of Harold Epstein by famed plantsman Jerry Flintoff, its enormous leaflets can reach over 6” long and 4-1/2" wide. Spreads 6-8" a year. It usually takes 2-3 years to establish itself and be
come most impressive. The flowers emerge before the leaflets unfurl in early spring. E. koreanum is notorious for just putting up one set of leaves per node each season. If the leaf suffers damage, the rhizome will remain dormant until the following year. ‘Harold’ is a great bold-textured vigorous ground cover for large areas where it can spread unimpeded. It is especially useful in combination with early spring bulbs for sequential bloom. After bloom the expanding leaves serve as camouflage for the dying bulb foliage. 15" tall. $18