Dahlia are tuberous rooted perennials with pinnately divided leaves and showy flower-heads, double in many cultivars, in summer and autumn
Single Orchid, or Star, dahlias have flowerheads with a single ring of outer florets surrounding the central disc; these florets are uniformly either incurved or recurved
'Honka' is an unusual cultivar to 1m in height, the starry flowers reduced to about 8 narrow white rays surrounding pale yellow central disk florets