HORTSERVICESHealth-related pruning - This type of pruning to remove dead or diseased wood that takes energy and vigor away from the plant. Pruning to open up shrubs and thin out the canopy promotes better air flow and reduces insect habitats. Shrubs that have been routinely sheared will benefit greatly from periodic thinning. Boxwood care is a specialty. Most of this work is done in the dormant season from November through March. Special rates apply at this time of year.