Rockspray Cotoneaster is a hardy, dense, slow to moderate growing, semi-prostrate shrub that grows 2 to 3 feet tall and spreads over time to 6 to 8 feet wide on stiff, flattened, horizontal branching that features branchlets arranged in a fishbone pattern. Branching becomes somewhat tiered over time. Plants are deciduous in the northern parts of their growing range but semi-evergreen in the far southern locations.