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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.

Ruth de Jauregui is an old-school graphic artist and writer who focuses primarily on garden topics.

Don’t worry that the plant won’t bounce back. In the spring, spirea will reward you’re courageous pruning with new stems and plenty of blossoms. 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 bushremove.buzzted Reading Time: 5 mins. Nov 23, Spirea requires rejuvenation pruning about once every three or four years. You should cut dead and old stems back to the ground each year. Writer Bio. Ruth de. Jul 18, Know when to prune your specific variety of spirea.

Dead, diseased, and broken branches should be removed at any time of the year but you should only prune healthy plant growth at the right time. If you have Japanese or Bumald Spirea, prune them in early spring before the flowering season 94%. Prune these spring flowering shrubs soon after they have bloomed. Top prune the plant to improve the shape and reduce its size, but be careful not to remove more than 30% of the top growth.

Some summer pruning can also be done on particularly vigorous plants, but not after mid-July. May 07, 3. Prune spirea to get big flower clusters. Spirea that’s not pruned or pruned to the ground each spring has a casual, loose habit. In early spring, before the leaf buds start to swell, cut all of the stems down so they’re 4 to 6 in.

tall. May 03, If some of the remaining stems are too long, trim them back by about a fourth to a third their length. To try to keep the center of a bush open, it is important to cut to an outward-facing bud. If your specimens are really overgrown, you might just want to cut the whole thing down to about a foot tall and wait a couple of years for new stems to grow. Nov 30, These shrubs will flower in either the spring or mid-summer, depending on the species. To get the best blooms, BrightView horticulturist Scott Kopitskie recommends giving your spirea a rejuvenation prune.

Don't be afraid of damaging your shrub; it will grow back in time for the season.