As with other late-spring flowering shrubs, prune"Goldmound" spirea in late winter to early spring before new growth begins. Mar 30, Wondering when to prune spirea bushes? 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 Estimated Reading Time: 5 mins. Mar 02, 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.
This removes the dead blossoms and also may trigger a second blooming and new leaf growth. Folks on this forum said I should do rejuvenation pruning on them. I did, cutting them to about 10". In no time they put on new growth and looked wonderful. I highly recommend this. Also, after I'd completed the pruning and could see the bases clearly, I discovered quite a few small plants.
Pruning during the first two seasons will help make the shrub thick instead of leggy. Deadhead after blooming to promote more flowering.
If you do not deadhead, they fade quickly and do not detract from the beauty of the plant. Goldmound Spirea has a natural disease resistance. It also tolerates heat well. Deer do not like to eat them.