in 15cm/1.5litre pots
The tallish stems of this deciduous plant hold narrow dark green leaves very sparingly. The flat purple flowers are produced in clusters throughout the summer. Grows to an approx height of 120cms.
Planting distances are very much a matter of personal choice and budget but as a rough guide 4 plants per sq. metre is adequate if you are patient, 6 per sq. metre will give better coverage while 9-12 plants per sq. metre will make a weed suppressing carpet quickly.