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Mar 30, The best time to prune spirea is after the first flowering. For a spring-blooming cultivar, a good time will be in late spring. For a summer-blooming variety, this will be in mid-summer. During the spirea trim, cut the back the tips of the stems to the top of the leaf bushfalling.barted Reading Time: 5 mins. You should actually prune your spirea more than once a year, at least twice.

Give it a good trim after it flowers in the spring by cutting back the tips of the stems to the top leaf bud. More drastically cutting back spirea should occur in the fall or in late winter to early spring.7 days ago. Read the full answer. Nov 23, To control the spirea's size and keep it blooming year after year, you should prune it back after blooming or when it's dormant in winter.

If it's severely overgrown, cut it to the ground to.