Agastache 'Blackadder'Common Name: 'Hyssop'
Long flowering, violet blue flowers from darker purple buds on aromatic fresh green folaige. It flowers from midsummer to frosts and the whorls of bottlebrush-like flowers are a magnet for bees and butterflies. Jul-Oct, H100cm S40cm.
Grow in well-drained, fertile soil in full sun. Hardy, though may be short-lived in cold wet conditions.