5 quarts Soil Mix Specially Blended for Spined Succulents Spined Cactus. 35% - 1/4" minus Natural Cascade Mountain Volcanic Lava. Pleasing mix of red, grey, black and white. 47% - 1/4" - 1/32" Natural Cascade Mountain Volcanic Pumice. Pumice has many tiny gaps or air pockets that allow roots access to oxygen, nutrients and water. Pumice improves both water retention and drainage. 18% - PRO-MIX BX MYCORRHIZAE is a general purpose peat based professional growing media. Approx. 5 dry quarts volume. Neutral PH, all natural, relatively light weight and porous for proper drainage for Spined Succulents Spined Cactus . Our potting mix is hand packed and bagged with a reusable tie for easy storage after you have used part of the bag. If your potting mix dries before using, moisten it to keep dust from forming. Dust from any rock or potting soil product should not be inhaled and can be irritating for people with sensitive lungs. We are a commercial Wholesale / Retail Plant Nursery with over 15 years mixing specialty potting mixes. Check out our other listings of custom potting mixes to select the perfect mix for your bonsai or specialty plants. Scenic Hill Farm is a licensed Oregon nursery -- license # L0170090NG