A vigorous rhizomatous perennial forming an extensive colony of upright, four-ribbed stems, up to 100 cm tall and wide. Typically sweet-scented leaves are oval shaped. Leaves are bright green, 5-9cm long and 1-3cm wide. Light purple flowers 2-3mm small are produced in interrupted, slender terminal spikes in summer Full sun Partial shade Aspect South–facing or East–facing or North–facing or West–facing Exposure Exposed or Sheltered Hardiness H7 Adapts to most soils
