Native to Eastern Siberia, China, Korea, and Japan, false spirea shrubs grow to 10 feet (3 m.) high and wide and keep spreading. Sorbaria false spirea grows suckers that turn into new plants. Because of this, your false spirea is likely to spread out and take over unassigned space if you let it.

How do you stop false spirea from spreading?

If you decide to leave the bush in place but want to control its spread, prune it hard in the early spring, just before the buds start to come out (as it blooms on new growth) and watch for (then dig out) those suckers!

Do spirea plants spread?

Birchleaf spirea has clusters of small white flowers that cover the foliage in late spring to early summer. A compact, rounded shrub, it grows 3 to 4 feet tall and has a similar spread.