About
Polystichum adiantiforme is a fern in the Dryopteridaceae family and a member of the Polystichum genus, a largely terrestrial group. Species in this genus are often found on rocky ground, stream banks and disturbed slopes and commonly form a crown of fronds from a stout, slowly creeping rootstock. Garden use follows those natural preferences: place where the plant can occupy rock crevices, banks or shaded areas that mimic montane or warm‑temperate habitats. Expect a vase-like ring of fronds to arise from the crown as the season progresses.
About the genus
Polystichum is a genus of ferns in the family Dryopteridaceae, subfamily Dryopteridoideae, according to the Pteridophyte Phylogeny Group classification of 2016. The genus has about 500 species and has a cosmopolitan distribution. The highest diversity is in eastern Asia, with about 208 species in China alone; the region from Mexico to Brazil has at least 100 additional species; Africa, North America, and Europe have much lower diversity.
Wikipedia contributors, "Polystichum", CC BY-SA 4.0 — Polystichum
In the garden
Polystichum adiantiforme belongs to the Polystichum genus, a widespread group of ferns in the Dryopteridaceae family that reaches greatest diversity in eastern Asia but occurs across North and South America, Africa and Europe. Polystichum species are primarily terrestrial or rock-dwelling and are frequently recorded on talus slopes, road cuts and alongside streams; a few species extend into alpine zones. These habitat affinities give a clear steer to where this species will perform best in cultivation. Treat it in the garden like a rock- or woodland fern: give a site that reproduces its natural conditions — sheltered, with firm substrate or humus-filled crevices and consistent moisture from nearby drains or features that prevent prolonged drought. Because many Polystichum form a crown of fronds from stout, creeping rootstocks, allow room for the ring of fronds to develop rather than crowding with heavy planting. In the UK, Polystichum adiantiforme suits rock gardens that replicate stream banks or stony slopes, wooded ravines and shaded borders where drainage is present but soils do not dry out completely. Observe the crown in spring for new fronds; the establishment pattern of new fronds from the central crown is a useful indicator of vigour and site suitability.
