Pro-Mix BX 3.8 cu. ft. Compressed Bale. It is a general purpose medium which creates a well balanced growing environment for annuals, perennials, foliage plants, potted flowering plants, vegetable transplants, greenhouse vegetables & indoor gardening. It is light weight, low bulk density, high water holding capacity. Vermiculite improves nutrient retention. Active ingredient Mycorrhizae improves fertilizer uptake, reduces fertilizer costs, increases plant's resistance to stresses, reduces maintenance costs & optimizes results without changing growing practices.