About

Roscoea is a genus of perennial plants of the family Zingiberaceae (the ginger family). While most members of the ginger family are tropical, Roscoea species are native to cooler mountainous regions of the Himalayas, China and its southern neighbours. Roscoea flowers superficially resemble orchids, although they are not related. The flowers of Roscoea have a complicated structure, in which some of the showy coloured parts are not formed by petals, but by staminodes, sterile stamens which have evolved to resemble petals. Some species are grown as ornamental plants in gardens.

How to grow it

Some Roscoea species and cultivars are grown in gardens, particularly rock gardens, as ornamental plants. Coming from monsoon regions, they require moisture in the summer but relatively dry conditions in winter. A moisture-retaining but well-drained soil is recommended, with a mulch of a material such as bark. They vary in their tolerance of sun exposure, most requiring shade for at least part of the day. In a Royal Horticultural Society trial, R. ganeshensis and R. purpurea f. rubra were the most harmed by excessive sunlight; R. cautleyoides, R. × beesiana and R. scillifolia the most resistant. In cultivation they do not appear above ground until late spring or even early summer; thus if planted deeply enough, up to 15 cm (6 in), they escape frost damage in regions where subzero temperatures occur. Different species and cultivars then flower throughout late spring and summer into early autumn.

They can be propagated by careful division in the autumn of the individual growth points produced by a large plant, or by seed. Seed should not be allowed to dry out.

Other Roscoea plants

Roscoea alpina · Roscoea auriculata · Roscoea australis · Roscoea bhutanica · Roscoea brandisii · Roscoea cangshanensis · Roscoea capitata · Roscoea cautleoides · Roscoea debilis · Roscoea forrestii · Roscoea ganeshensis · Roscoea humeana