Mosser Lee ML1140 Red Lava Rock Soil Cover, 1.5 dry qt. Covers soil of indoor and container plants Improves water drainage from soil when used to line the bottom of pots and containers Ideal for terrariums, dish gardens and crafts Excellent for bonsai plantings Convenient size is easy to carry and work with Decorative lava rock comes from well below the earths crust, deposited by old volcanic eruptions The reddish color reflects the original mineral deposits Long since scorched to produce this porous and useful rock Place on top of any potted soil to reduce moisture evaporation in interior houseplants Available in 1.5-quart