How to Propagate giant hyssop 'Blackadder'?
Root semi-ripe cuttings in late summer and overwinter under cover; propagate by division in spring. This cultivar is sterile
giant hyssop 'Blackadder' · Agastache 'Blackadder'
Grow in well-drained fertile soil in full sun. Excellent drainage is especially important during the winter months. It can suffer during cold wet winters
Root semi-ripe cuttings in late summer and overwinter under cover; propagate by division in spring. This cultivar is sterile