Bio Grow is screened 10mm, similar to Bio Prepare but having a much more refined appearance. Each compost windrow ( or pile) has spent months maturating through a gradual series of changes degrading into dark moist stable compost. At the optimum time the compost is subjected to screening to remove any unwanted materials. It will contain many qualities to improve your soil; it will contain woody material trace elements, minerals and micro organisms. Bio grow is used for hanging baskets, planters and on your flower borders adds an aesthetic dimension and helps reduce weed growth. This compost can be mixed with top soil or used as a effective growing medium as it has a similar composition to top soil.