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Furthermore, how fast does spirea grow?
Growing spirea shrubs is extremely easy, and these flexible plants are hardy in just about any growing zone. Spirea bushes are available at most garden supply stores and greenhouses and should be planted during the spring or fall for best results. Depending on variety, spirea bushes grow from 2 to 6 feet tall.
Secondly, what does the plant spirea look like?
Nippon spirea is an upright, mounded shrub reaching 4 to 5 feet tall and wide, with graceful overhanging branches. Bouquet-like clusters of small white flowers smother the branches in late spring. The deep blue-green leaves are a handsome attribute during the summer months.
More drastically cutting back spirea should occur in the fall or in late winter to early spring. Remove any dead branches and use this trimming to shape the shrub. Cutting it way back will stimulate new growth in tighter clusters so that you can get a more rounded, compact shrub shape.