Answer: Spiraea x bumalda 'Anthony Waterer' blooms on new growth of the season, so it is pruned in late winter to early spring. Cut it back quite hard, by about two thirds or so, to remove all winter damaged stems and to create a symmetrical shape. Do this before it begins to leaf out. After the first big flush of blooms, you can shear it all over lightly to deadhead and encourage additional blooming later in the season. Enjoy your spirea!
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