What are Worm Casting? Castings (worm poop) from composting worms have been recognized as a natural fertilizer that is packed with a lot of nutrients and minerals. Worm castings contains minerals such as concentrated nitrates, potassium, magnesium, calcium, and phosphorus. Worm castings are also a 100% organic fertilizer that can increase a plant’s yield, protect… Continue reading Benefits of Worm Castings on Garden