The answer to 'when to shrub' is that the best time to prune or trim shrubs is typically in late winter or early spring, before new growth begins. This allows the shrubs to recover and regrow in the spring and summer months.
Shrubs should be pruned or trimmed every 1-3 years, depending on the type of shrub and your desired aesthetic. Overgrown or unruly shrubs may need more frequent trimming, while slower-growing varieties can often go longer between prunings. It's important to prune at the right time to avoid damaging the plant and to encourage healthy, vibrant growth.