The answer to 'frequency of mulching' is that most experts recommend mulching 1-2 times per year, typically in the spring and fall. Mulching helps retain moisture in the soil, suppress weeds, and insulate plant roots from temperature extremes. The ideal depth for mulch is 2-4 inches, and it's important to keep the mulch a few inches away from the base of plants to prevent rot.
Mulching in the spring helps protect plants as they emerge and start growing, while fall mulching helps insulate roots over the winter. However, the exact frequency can vary depending on factors like climate, plant types, and how quickly the mulch decomposes.