The answer to 'how often to shrub' is that most shrubs should be pruned once or twice per year, depending on the type of shrub and your desired aesthetic. Deciduous shrubs, which lose their leaves in the fall, should be pruned in late winter or early spring before new growth appears. Evergreen shrubs can be pruned in late spring or early summer after the main growth flush has occurred.
Proper pruning helps maintain the shape and size of shrubs, encourages new growth, and keeps them looking their best. It's important to prune at the right time of year for the specific shrub variety and to use the proper pruning techniques to avoid damaging the plant.