Black Lava Rocks for Plants Natural Horticultural Volcanic Rock (1/4" Size) (Mined in USA) (10-lb Bag)Brand: Midwest Hearth Color: Black Features: MULTIPLE USES: Cacti, bonsai, succulent containers, and potted plants SMALL 1 4 INCH SIZE Lava rocks have an average size of approximately 1 4" in diameter 100% NATURAL Pure volcanic rock with no additives, dyes, or fillers PROTECTS PLANT ROOTS When placed at the bottom of the planter, lava rocks create a place for excess water to pool away from your plant's roots AIDS WITH WATERING Lava rocks are naturally