How to Fertilize giant hyssop 'Blackadder'?
Balanced perennial feed every four weeks from spring through summer
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
Balanced perennial feed every four weeks from spring through summer