Greensmix 0.5 cu. ft. Red Lava Rock is a long-lasting and low-maintenance landscaping material. It will not decay and helps with erosion, making it an ideal alternative to wood mulch. This red lava rock is available in a 0.5 cubic foot bag and is sized from 3/4 inch to 1-1/2 inch. It can be used in flower beds, pathways, around pools, and in other landscaping applications.