Gymnocarpium dryopteris – Oak Fern –

Description

Gymnocarpium – There are about 5 species of deciduous, ground covering, rhizomatous, terrestrial ferns, in this genus. They occur in moist woodland throughout the Northern Hemisphere. Fronds, arising singly from long, creeping rhizomes in spring, are triangular and 2-pinnate or pinnatifid, with leaf blades that are bluish green, or yellow green and tilt at a right angles the light. Small, rounded sori on the undersides of the fronds, are without a protective indusia. Ideal groundcover or rock garden plant in moist, shady places. Grow in preferably neutral to acidic, fertile, leafy, moist soil, enriched with compost before planting in light to deep shade. Can become invasive. Divide in spring. G. dryopteris – Oak Fern – This deciduous fern from Europe, Turkey, Northern Asia, China and North America grows 8″ tall with an indefinite spread. It produces triangular, 2 pinnate fronds, each with a leaf blade 4-7″ long and across, on stem 4″ long. Pinnae are triangular, divided into oblong to ovate, toothed and scalloped segments. Pale yellowish green when young, the fronds darken to vivid rich green. Zones 4-8