The answer to 'how to maintain shrub' is to regularly prune, water, and fertilize your shrubs to keep them healthy and looking their best. Proper shrub maintenance involves trimming away dead or damaged branches, watering deeply during dry spells, and applying a balanced fertilizer a few times per year.
Start by inspecting your shrubs regularly and pruning away any dead, damaged, or overgrown branches using clean, sharp pruning shears. Prune just above an outward-facing bud or branch to encourage the shrub to grow in an attractive, natural shape. Water shrubs deeply, applying about 1 inch of water per week during the growing season. In the spring, apply a slow-release balanced fertilizer according to the product instructions to provide nutrients for healthy growth.