Polystichum rigens - Rigid Holly Fern

Polystichum rigens is an adorable hardy Japanese fern with a refined and very visual appearance. This evergreen to semi-evergreen species forms a dense clump of compact and tough fronds, with pointed tips that are bright yellow-green in spring and later darken to a matte green colour. Its compact growth, slow development, ease of cultivation, and highly structured architecture make it a very attractive border plant, and also perfect for shaded containers. It thrives in shade or partial shade, in well-drained, moist, fertile soil without limestone.

Polystichum rigens is a slow-growing terrestrial fern, native to Japan and China. It is a perennial plant of the Dryopteridaceae family, with an ascending rhizome, closely related to the male fern. Polystichum rigens forms a green, furrowed stipe (a kind of false trunk), reaching one-third of the size of each frond, covered with brown scales at the base. This short stipe releases a very dense tuft of foliage, about 40 cm (16 in) tall and 50 to 60 cm (20 to 24 in) wide. The bipinnate lamina has a triangular and narrow shape, with an acid-green colour turning to medium green. Each frond is composed of 12 to 15 pairs of pinnate pinnae, ending in a pointed spine. Young plants sometimes emit an odour that may be unpleasant, but it is only noticeable at a very short distance and quickly dissipates.

The polystichums make up a very diverse and particularly decorative genus throughout the year in most species and varieties. Fully hardy, Polystichum rigens is a small, highly ornamental plant, ideal for decorating a terrace or balcony. In the garden, it will find its place in a shaded rockery, in the company of saxifrages and bergenias, or form beautiful borders, associated with hart's-tongues, Welsh poppies (Meconopsis cambrica), candelabra primroses (Primula bulleyana), or Japanese primroses (Primula japonica). In a container, it can be accompanied by small fuchsias, horned violets, or variegated hostas.