Adams Elder
Elder, Adams

A thicket-forming shrub with large flat-topped clusters of small, fragrant white flowers in...

Rosa acicularis
Rose, Prickly

A wild rose species native to North America. Has a thicketing habit, produces suckers. ...

Spirea, Ashleaf
Spirea, Ashleaf

A.K.A. Ural Falsespirea.  This shrub has a thicketing nature and will fill an area fairly...