Luster Leaf introduces their natural coco coir pith in a compressed 1.4lb. brick. This premium seed starting mix is an ideal growing medium for organic applications. It retains water extremely well for growing plants hydroponically (soil free). Feel good about this renewable product, using what was once a waste product (coconut husks) and re-purposing it to grow more plants! Another great Luster Leaf product for successful gardening!