Abstract: A method of processing fibrous waste materials, such as textile waste, in which the waste materials which are not particulate are formed into particles, and the particles are thoroughly mixed to form a waste mixture. The waste mixture has an increased temperature which allows the mixture to be used as a heat source as well as a plant growth medium. A particulate source of calcium may be added to the mixture if it is to be used as a plant growth medium. The plant growth medium may be mixed after formation with a dry wood waste mixture to enhance both its growth and heat properties.