Combining Viagrow Coconut coir with vermiculite and perlite equals one amazing premium planting mix. Viagrow horticultural perlite is commonly used alone for a completely inert hydroponic medium with good capillary and air retention properties. Viagrow Vermiculite is a natural soil amendment that promotes moisture retention and aeration in potting mixes and delivers vital elements to the plant roots resulting in better root development, growth rates and yields. Viagrow Vermiculite #3 naturally attracts and holds positively charged ions, like potassium, magnesium, calcium, and ammonium, releasing these vital elements to the plant roots. It even contains potassium and magnesium, which are then available as a supplemental slow-release supply of essential nutrients. Viagrow vermiculite has been developed with Successful Growing in Mind with a negative charge, it provides an excellent cation-exchange capacity which promotes healthy bacteria in your growing media and attracts and holds positively charged ions, improves water retention, wettability, has pH stability in soilless mixtures and Exhibits greater particle strength. Included in this kit is a Viagrow 5KG Coco Coir brick which expands to 2.4 cubic feet. This 11lb (5kg), high quality, low sodium, sterile growing medium is an alternative to sphagnum peat moss and absorbs great amounts of water, lowering watering frequency. Simply add water to expand your brick in no time at all.