Mulches add organic matter which improve soil quality and help to make your garden healthier and more resistant to pests and disease. It helps to keep the soil cooler by shielding it from the sun, prevents evaporation and weed growth and it obviously looks good.
Recommended is 7.5-10cm thickness
You can also consider non-organic mulches, which do not decompose and are very decorative like Blue Metal, recycled Brick, Pea Gravel or other rocks.
