Jowlawn Mix Horticultural Lava Rock Pebbles - 2.7lb Pumice Potting Soil Amendment for Succulents Cactus Plants, Gritty Rocks Decorative Gravel Plant Drainage for Terrarium Potted Plants apm-hovermodule-opacitymodon img {opacity:0

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also known as volcanic rocks

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Jowlawn Mix Horticultural Lava Rock Pebbles - 2.7lb Pumice Potting Soil Amendment for Succulents Cactus Plants, Gritty Rocks Decorative Gravel Plant Drainage for Terrarium Potted Plants apm-hovermodule-opacitymodon img {opacity:0Good DrainageOur mix horticultural lava rocks, because of their cellular texture, characterizing porosity, good drainage and aeration while maintaining enough moisture, helps your potted plants effectively prevent root rot. Wide UsageLava rocks are the best potting mix for drought enduring plants, especially good for bonsai trees and houseplants, such as succulents and cactus. Lava rock mix is also the best top dressing to discourage fungus gnats. You