It’s simple to prune shrubs as long as you do it at the right time. Generally it’s best to prune deciduous shrubs during the winter months when they’re in their dormancy. Take summer flowering deciduous shrubs like buddleja back in late winter, cutting stems back to two or three buds just before they come into leaf. Cut back winter flowering deciduous shrubs like weigela after flowering is over in late autumn, cutting back each flowering stem to two or three buds. Evergreen shrubs like holly and viburnum need different pruning. Go for it after flowering is over. Prune back your evergreen shrub, making sure to remove congested branches as well as diseased or dying foliage. If you want to do a harsh prune or reduce a very overgrown evergreen shrub, it’s best to wait until early spring before buds break. Always use clean, sharp equipment to prune your shrubs.