Dryopteris carthusiana aka Narrow Buckler Fern

Dryopteris carthusiana is a perennial fern called toothed wood fern. Other names include spinulose woodfern and narrow buckler fern. It grows across temperate parts of the Northern Hemisphere. Its range includes Europe, Asia, and North America. It is native to Britain and Ireland. Wild plants grow in damp woods, swamps, and wet heaths. They also grow beside streams and in wooded bogs. The name Dryopteris spinulosa appears as a synonym.

This fern forms an upright clump with arching fronds. Garden plants reach about 1.5–3 feet [0.46–0.91 metres] tall. Their spread reaches about 2–3 feet [0.61–0.91 metres]. RHS gives an upper height and spread of 3.3 feet [1 metre]. The clump has a vase shape and a fine texture. Bright green fronds spread outward from the centre. Each blade narrows toward its tip and has finely toothed edges. The divided blades have a soft, lacy look. Brown frond stalks may bear dark scales.

The fronds can turn yellow before they die in autumn. Plants may keep green fronds through mild winters. In colder areas, they lose their foliage. This fern has no flowers or fruit. It makes spores instead of seeds. Gardeners can raise new plants from spores or divide clumps. Growth proceeds at a moderate pace. RHS gives five to ten years for plants to reach maturity.

Grow it in partial or full shade, sheltered from wind. It prefers moist soil with good drainage and ample organic matter. Loam suits it well, though RHS also lists clay and chalk. Acid soil is preferred, but RHS includes neutral and alkaline soils. Keep the soil moist rather than allowing it to dry. Sources place it in USDA zones 3–8, with NC State also listing zone 2. RHS rates its UK hardiness H5. It needs little upkeep. Remove dead or damaged fronds before new growth starts.

Use it in shaded borders, woodland gardens, or native plant beds. Groups can form ground cover beneath shrubs. It pairs with hostas, heucheras, and spring wildflowers. Deer and rabbits seldom damage it. Sources report few pest or disease problems. PFAF records food uses for roots, leafstalks, and young fronds. However, fresh plants contain thiaminase, which can deplete vitamin B. Cooking destroys that enzyme but does not establish overall food safety. PFAF also records historical root use against intestinal worms. It warns that such treatment needs qualified supervision.