Potting soil provides plants the necessary nutrients, structure and moisture retention for appropriate growth. Age and improper storage Expand potting soil. The useful life of potting soil depends on whether it is currently being used. Unused potting soil lasts approximately six months before it degrades in quality, while used potting soil should be replaced every year or two.
Potting Soil Storage
Potting soil stores best when kept in a lidded container away from heat sources and high humidity. Close the surface of this original bag and fasten it, then put it at a galvanized can or plastic bin. The storage container should be kept out of this rain and direct sun to limit bacterial growth in the soil.
Potting Soil Rejuvenation
Potting soil can take on another life if thoroughly cleaned and amended after use. Pick through the soil to remove any roots or other plant debris. Run water through the soil to leach out the extra salts, then combine it with fresh compost in a 1-to-1 ratio. A light dusting of gypsum and lime as well as roughly 1 tablespoon of general purpose fertilizer should then be added to each 1 gallon of soil.