How Big Do Spirea Get?

Plant sizes vary by species and cultivar, and they range from 1½ to 8 feet tall. There are many species of spireas (greater than 80), but only the most commonly encountered species and cultivars are included here.

Can you keep spirea small?

Throughout the summer, the plants shape can be maintained by cutting back overgrown spirea shoots or stems as well as any dead or diseased branches. Try to make the cuts within ¼ inch (6 mm.) of a leaf or bud. ... To keep spirea looking great and to promote blooming, trim the plant at least twice per year.

How do you stop spirea from spreading?

In areas where the population of spirea is sparse or in areas that are environmentally susceptible, one way to stop the spread of Japanese spirea is to cut or mow the plant. Repeated mowing of the invasive plant will slow its spread but not eradicate it.