Appearance
It is a large, erect deciduous shrub growing to 3 m tall and wide, with broadly oval leaves. The flowers are typically borne in large flat heads in late summer, and are in variable shades of pale blue and pink, fringed by white or pale pink sterile florets.
Naming
The Latin "aspera" means "rough-textured" and refers to the downy lower surface of the leaves.References:
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