BUTTERFLY & BEE NECTAR. 'Black Adder' Anise Hyssop (Agastache 'Black Adder') Producing lavender-blue bottlebrush flowers July thru September, 'Black Adder' Anise Hyssop grows 24"-36" tall and attracts several species of butterflies. It also attracts many species of bees, and bees are of high importance for pollination of food crops. It is an easy care, deer resistant plant. Perennial, zones 6 - 9.