Mulch Black Our Premium Mulch is 3/4″ to 3″ in length and made from reclaimed and recycled woods, both deciduous and evergreen, then colored chestnut brown with a mineral and vegetable based dye. Our mulch is an attractive product that can withstand wind without jumping from your beds. We suggest putting down a minimum depth of 3 inches to help retain moisture, which will allow you to reduce watering and up to a depth of 5 inches to control weeds. Premium Bark Mulch gives you a professional looking garden. The colour of this mulch is black, which gives it the appearance of natural looking soil.