We are a small family worm farm. 20% Worm Castings added to your soil will improve germination rates, plant growth, and increase disease resistance. It will AMEND - FEED your Soil. Worm Castings is Earth Worm Poo. We are a small Earth Worm Farm. Mostly raising Red Wiggler Composting Earth Worms. We have 10 and 5 pounds bags available.