24 tall x 12-18 wide. Northern Dragonhead (Dracocephalum ruyschiana) is a bushy perennial that enjoys a full-sun site with some shelter from afternoon rays in hot climates. Each flower resembles a gaping dragons head hence Northern Dragonheads common name! Though tolerant of drier soils, Northern Dragonhead appreciates regular watering and will do its best in well-draining but moisture retentive soil with average-to-good fertility. After the plant blooms, trim back by a third to encourage a tidy habit and fresh new foliage. A good choice along sunny walls or pathways, Northern Dragonhead is rarely severely damaged by browsing deer.