Pumice or bims is a type of volcanic rock often used in bonsai soil mixes. It is appreciated for its porous and light structure, which allows for good water drainage and air circulation around the roots of your bonsai. Pumice is also pH neutral and will not decay over time, making it an ideal ingredient for bonsai soil. When used in a bonsai soil mix, pumice helps to prevent soil compaction and provides ample support for the roots, allowing the tree to thrive. It is often combined with other materials, such as akadama, lava rock and bark, to create a well-draining, nutrient-rich growing medium for bonsai trees.
