How to Prune Ogisui barrenwort?
No pruning required, but cutting back in late winter or early spring, before flower spikes form, will improve appearance

Ogisui barrenwort · Epimedium ogisui
Grow in fertile, humus-rich, moist but well-drained soil in partial shade, with shelter from cold, drying winds; where frosts are prolonged or severe, spread an organic mulch such as leaf mould or composted bark to protect plants over winter
No pruning required, but cutting back in late winter or early spring, before flower spikes form, will improve appearance