This is for 1 gallon, 2 gallons or 3.5 gallons of mushroom compost. Free shipping. Mushroom compost fertilizer makes an excellent growing medium for garden plants. When turned into compost and fed to plants and vegetables, it becomes a nutrient-rich fertilizer. It can be mixed into the soil or used as top dressing. It contains horse stall cleanout, poultry litter, sphagnum peat moss, cotton seed meal, gypsum, lime and cocoa shells. This listing is for 1 gallon @ $16, 2 gallons @ $26 or 3.5 gallons @ $36. Shipped in USPS flat rate priority envelopes or boxes.