has been shown to cause a 173.5% increase in plant growth by mass over plants grown without castings.
These results were seen with only 10% addition of castings to produce these results.
(from manufacturer website)
"The Worm-Wigwam has kept me in the worm business. I was going to give it up because it was just too much work. Then I found the Worm-Wigwam and everything changed for the good. I'm now having the time of my life growing and selling worms without the intense labor I was going through before.