Dryopteris oreades aka Dwarf Male Fern

Dryopteris oreades is known as the mountain male fern. Dwarf male fern is another common name. This perennial grows in temperate parts of Europe and western Asia. Kew gives its native range as Europe to the Caucasus. It is native to Britain and Ireland. Wild plants grow on rocky mountain ground and scree slopes. These sites may be open or have some shade.

This fern forms clumps with upright fronds that arch outward. It keeps some of its leaves through winter. The fronds range from mid-green to grey-green. Many small leaflets give each frond a fine, feathery look. The RHS describes plants reaching 1.3–2.6 feet [0.4–0.8 metres] tall and wide. Its broader size guide allows 3.3 feet [1 metre] each way. Chicago reports about 3 feet [0.9 metres] tall and 2 feet [0.6 metres] wide. These figures show some scope for size to vary in gardens.

Grow it in shade or partial shade with good drainage. The soil should stay moist without holding excess water. The RHS lists clay and loam as suitable soils. It also lists acid to neutral soil conditions. A sheltered site facing north or east suits its needs. The RHS gives a maturity range of two to five years. It rates the fern H5 for British growing conditions. Chicago lists USDA hardiness zones 5–9. Both sources support its use in shaded garden sites.

The fern suits woodland gardens, shady borders, and planting beneath trees. It can also serve as ground cover or a specimen. Its divided fronds provide the main visual interest. The RHS recommends it for wildlife gardens as well. Routine pruning is not needed to maintain its shape. Remove dead or damaged fronds when needed. Grow new plants from ripe spores or divide clumps in spring. The RHS reports few pest or disease problems. PFAF does not flag it as a weed risk.

PFAF records no known food use for this species. It reports thiaminase in the fresh plant, which can deplete vitamin B. This makes eating the plant a health concern. PFAF also records past medicinal use of the root against internal worms. Such use needs qualified oversight because the root can cause harm. These records do not establish the fern as safe to eat.