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Mar 30, 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 branches. Pruning also improves airflow, which is vital to the wellbeing of the spirea. Without proper airflow, fungal diseases thrive. Lastly, routine pruning solves Estimated Reading Time: 5 mins.

Oct 15, Experts even suggest cleaning both the sides of the blades with a dishwashing liquid or rubbing alcohol. This is to make sure there’s no transfer of diseases or pests that can potentially harm your plant. 2. Cut the Tips. Start at the tips of your spirea when pruning by trimming it.