Hedge woundwort

Hedge woundwort, Stachys sylvatica

Flowers: Reddish-purple with white markings, elongated, 13-18mm long (1/2-5/7in), borne in loose terminal spikes
Leaves: Pointed, toothed, on square hairy stems
Habitat: Shaded hedgebanks, woodlands
Season: Blooms Jul-Sep.