Epimedium are rhizomatous perennials with evergreen or deciduous, ternately or pinnately divided leaves, and open sprays of small, bowl-shaped flowers, often with prominent spurs, in mid to late spring
'Sulphureum' is a deciduous perennial to 35cm in height, forming a clump of red-tinted, light green leaves. Primrose-yellow flowers 2cm in width are carried in open sprays