Amazon: crushed pumice
Amazon's Choice for crushed pumice. Patches of Green Bonsai & Succulent Garden Pumice Rock from 14 Dry Quarts. 4.9 out of 5 stars 20. $29.49 $ 29. 49. Get it as soon as Thu, May 14. FREE Shipping by Amazon. Only 10 left in stock order soon. Bonsai Jack 1/4 inch Horticultural Pumice Soil Amendment for Cactus and Bonsai, 2 Quarts.