Cyrtomium spp.
holly fern
Overview
Cyrtomium spp. is a genus of evergreen ferns in the wood fern family (Dryopteridaceae), comprising roughly fifteen to twenty species native to eastern and southern Asia, with outliers in Africa, Hawaii, and the Pacific. Plants grow from a short, erect, scaly rhizome that forms a tight crown, producing a shuttlecock of arching once-pinnate fronds 12-30 inches (30-75 cm) long. Each frond carries several pairs of broad, leathery, glossy dark-green leaflets with toothed or slightly spined margins, a shape that recalls holly leaves and gives the group its common name of holly fern. Unlike many ferns the leaflets are thick and tough, giving the foliage a hard, polished texture that withstands handling. As with all ferns, Cyrtomium spp. reproduces by spores rather than flowers; the spores form in round clusters scattered across the underside of the leaflets and shed in summer and autumn. Several species tolerate cool conditions, dry air, and low light better than most ferns, and C. falcatum has naturalised on walls and in mild coastal areas well beyond its native range. The genus grows in shaded woodland, on rocky banks, and in crevices, and is widely grown indoors and in shaded gardens for its tough evergreen fronds.
Native Range
Cyrtomium spp. is native to eastern and southern Asia, including China, Japan, Korea, the Himalayas, and Southeast Asia, with a few species in southern Africa, Hawaii, and Pacific islands. It grows in shaded woodland, on rock faces, and in crevices. C. falcatum has naturalised in mild regions of Europe, North America, and Australasia.Suggested Uses
Cyrtomium spp. is grown as an evergreen fern for shaded borders, woodland gardens, rock crevices, and shaded courtyards, and as a tolerant houseplant for cool, low-light rooms. The glossy fronds are also cut for foliage in arrangements. The tough texture suits positions where softer ferns would scorch or tatter.How to Identify
Growing Conditions
Sun Requirements
Tolerates up to 4 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight
Care & Maintenance
Care Guide
Cyrtomium spp. grows in part to full shade in moist, humus-rich, well-drained soil and tolerates dry air, cool rooms, and lower light than many ferns, which makes it a frequent houseplant. Even moisture suits the genus, though established plants tolerate short dry spells better than most ferns. Hardy species such as C. fortunei withstand frost to about USDA zone 6, while C. falcatum is hardy in milder zones 8 and warmer. The fronds are evergreen and persist through winter where temperatures allow. Few pests trouble the genus, though scale insects can appear on indoor plants. An annual mulch or top-dressing maintains the humus-rich conditions the roots need.Pruning
Pruning is limited to removing old, damaged, or faded fronds at the base in late winter or early spring before new growth unfurls. Tidying spent fronds keeps the crown open and shows the fresh foliage. No other cutting is needed.Container Growing
✓ Suitable for container growing
Minimum container size: 2 gallons