The foundation of Sunshine Advanced Mix #4 is Canadian Sphagnum peat moss, sustainably harvested from carefully managed bogs in rural Canada. The peat moss is blended with horticultural grade perlite, coir, dolomitic lime, a starter organic fertilizer, mycorrhizae and an organic wetting agent to complete the mix. Lime adjusts the pH for optimum fertilizer availability; the starter organic fertilizer helps transplants establish, mycorrhizae assists in fertilizer uptake and the organic wetting agent helps peat moss absorb water better.