The answer to 'frequency of hedge' is that the ideal frequency for trimming and maintaining hedges depends on the type of hedge, its growth rate, and your desired appearance. In general, most hedges should be trimmed 2-4 times per year to keep them looking neat and tidy. Faster-growing hedges like privet or boxwood may need more frequent trimming, while slower-growing hedges like yew or holly may only need trimming once or twice per year.
The best time to trim your hedge is typically in the spring or early summer when the plant is actively growing. This allows the hedge to recover and fill back in quickly. Avoid trimming in the fall or winter when the plant is dormant, as this can stress the hedge and lead to die-back. Always use clean, sharp pruning tools and make sure to remove any dead or damaged branches as you go.