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Mar 02, You should actually prune your spirea more than once a year, at least twice.
To divide your plant: Using something like a spade or saw, cut the root crown into quarters.
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. You can also shape the shrub at this time.
Mar 30, Spirea bushes with red fall foliage and dead flowers blossoms are ready for a prune. Plan on pruning a spirea bush at least twice a year.
Regular, scheduled trimming promotes good health and new growth. Removal of dead or excess branches allows sunlight better penetration to the interior and lower treenotch.barted Reading Time: 5 mins.
Oct 25, Spirea shrubs respond well to pruning. In the spring, after the first blooms are spent, cut the dead flowers back by trimming spirea’s stem tips back to the topmost leaf on each stem. Throughout the summer, the plants shape can be maintained by cutting back overgrown spirea shoots or stems as well as any dead or diseased branches.