Mulch can help prevent weeds from growing by blocking sunlight and preventing weed seeds from germinating. Here are a few ways in which mulch can help with weeds:
Blocks sunlight: When mulch is spread over the soil, it blocks sunlight from reaching the weed seeds, which prevents them from growing. This can be especially effective when using thick layers of mulch.
Maintains soil moisture: Mulch helps to maintain soil moisture levels by reducing water evaporation from the soil surface. This helps to keep the soil moist for longer periods, which can help prevent weed seeds from germinating.
Adds organic matter: Organic mulches, such as shredded leaves or compost, break down over time and add organic matter to the soil. This improves soil health and can help promote the growth of desirable plants, while suppressing the growth of weeds.
Smothers existing weeds: Mulch can also be used to smother existing weeds by covering them with a thick layer of mulch. This cuts off their access to sunlight, effectively killing them.
Overall, mulch can be an effective tool for controlling weeds in the garden, as it helps to create a barrier that prevents weed seeds from growing, while also improving soil health and moisture levels.