Oct 25, Fall is the time for the most severe pruning of spirea. With sharp shears, cut each stem back to about 8 inches (20 cm.) from the ground. Don’t worry that the plant won’t bounce back. In the spring, spirea will reward you’re courageous pruning with. 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 the back the tips of the stems to the top of the leaf bushcutter.buzzted Reading Time: 5 mins. Mar 02, Tie a piece of rope around the center of the shrub. Trim straight across the top of the plant, and when you release the rope you’ll have a perfectly rounded spirea. The two main trimming periods, in early spring and after blooming, are most important to do each year, but you can also trim your spirea as needed throughout any season.
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. Jun 23, There are several tools that you will need to perform your pruning or trimming of a spirea.
Each of them is appropriate for different cases depending on age, time of year, type of pruning, etc. Hand Pruning Shears: Stems up to half inch in diameter can be pruned with hand shears. Lopping Shears: It is suitable to use on stems between half inch and 2 inches in Estimated Reading Time: 9 mins. When to Prune. Blue spirea blooms on new growth. This means you should do most of your pruning either in winter or at the beginning of spring before the onset of new growth.