Vermicrop Organics VermiBlend Premium Soil Amendment was created for the organic gardener. A rich blend of compost, earthworm castings, Alaskan humus, Fossilized Kelp and Mycorrhizae will help you grow a lush bountiful organic garden. 1 Bag of VermiBlend amends up to 5 cubic ft of potting soil. Our compost is inoculated with our Vermi T to increase the decomposition and fertility of the compost it is also screened to removing the majority of the woody and non-decomposed materials out- leaving only the richest, healthiest organic matter. This compost blended with our earthworm castings is the key to breaking down the hydrophobic layer and to the feeding of the earthworm castings. Both the earthworm castings and compost increase water retention in sandy soil and improve drainage in clay soils. The Fossilized Kelp is full of vitamins, micro nutrients, minerals and most importantly has a high available amount of calcium. The Endo/Ecto Mycorrhizae attach to the roots of plants and the fine filaments.