Our nursery has been growing blueberry plants for over 30 years. Each year we sell over 3000 blueberry plants and this is the soil we use. Trusted by professional blueberry growers everywhere, this blueberry potting soil mix is what works best for both the growth and performance of their plants. Components include: 30% - 3/8" minus- Fine Fir Bark, unscreened. 30% - Fir sawdust 16% - 3/8" minus Natural Cascade Mountain Volcanic Pumice. Unscreened. 12% - Peat Moss 12% - Perlite All natural, relatively light weight. Available in 15 Oz., 10 Cups, 5 Quarts, 3 and 6 Gallon volumes. 15 Ounce quantities are shipped First Class, 10 cup and 5 quart quantities are shipped Priority Mail, 3 and 6 gallon are shipped UPS. - Our 10 cup box will fill 1 1/3 trade gallon containers trade gallon containers. - Our 5 Quart box will fill 2.5 trade gallon containers. - Our 3 Gallon box will fill 6 trade gallon containers. - Our 6 Gallon box will fill 12 trade gallon containers. - Our 12 Gallon box will fill 24 trade gallon containers. 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 30 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.