This sand is popular for its excellence in propagation. It is also used widely in the building industry under paving stones. A unique by-product from our own quarrying operation producing washed sand for the concrete industry. Daltons Propagating Sand is a 3mm hard sharp sand containing silica and feldspars. It is free from weed seeds and pathogens because of its land mined origin. Proven and recommended by leading nurseries for propagation.