Sunshine? Mix #4 with Mycorrhizae is an ideal choice for both indoor and outdoor gardening. Formulated with Canadian Sphagnum Peat Moss for increased moisture retention, optimum air exchange and high cation exchange capacity (CEC) plus coarse perlite for amplified root zone aeration. The lime, gypsum and proprietary wetting agent combine to make Sunshine? Mix #4 with Mycorrhizae the professional quality mix which meets the needs of serious minded growers.