GROW!T Organic Coco Coir Mix, BlockUse organic GROW! T Coco Coir Mix for planting and growing flowers, vegetables, herbs, and more. It works as both an indoor and outdoor planting mix and is ideal for hydroponics systems. Although each block of mix is equivalent to more than 2. 5 cubic feet of soil when water is added, it is lightweight and easy to carry and store. Add the GROW! T mix into your growing system and notice the coco coir difference.