Why Choose BuildASoil Worm Castings? 

BuildASoil Worm Castings are simply the best source of castings we've ever had the pleasure of working with. This is because it tests so consistently balanced 

Worm Castings will ship for free when you have 2 or more items in your cart, including this one.

Check out the soil testing we do on this material. This testing is consistent and well balanced, allowing you to use these castings confidently without fear. No other company goes to this length to ensure results. Don't settle for non-tested brands! High in calcium and low in sodium, these castings are ideal for your soil. 

 Convenient Sizes Available 

• 2 Gallon
• 1/2 Cubic Foot
• 1 Cubic Foot (Approx. 35 lbs)

Perfect for home gardeners, small-scale growers, and anyone looking to improve their soil health without needing bulk quantities. 

 Features & Benefits 

• Black and rich with moist well-screened castings 
• Always fresh, never last year's leftovers 
• Ideal for compost tea and soil building 
• Supports soil biology and plant health 
• Guaranteed 100% satisfaction within 60 Days or your money back 

Enjoy the best quality castings with our convenient options, perfect for any gardener. 

 How To Use 

•  Compost Tea: 2.38% by volume. Just under 2 cups of Worm Castings per 5 gallons of water. Read more
•  Soil Building: Use 15-20% Worm Castings in your potting soil recipe for vegetables or any heavy-feeding annual flowering plant.
•  Top Dress: Use liberally as a top dress anytime throughout the plant's life. Top dress 1"-2" inches to make a nice layer.

 Testing & Quality Assurance 

Check out our Batch Testing Area and scroll down to worm castings to see the most recent results.