Luzula sylvatica is the largest woodrush, with stems 30–80 centimetres (12–31 in) high. It forms clumps of bright green leaves which are glossy, flat, linear, about 10–30 centimetres (3.9–11.8 in) in length and 1 centimetre (0.39 in) wide; its leaves remain green or at least greenish throughout winter.