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)
"We're very satisfied with our Worm Wigwam and thrilled that we finally have
a vermicomposting system that works so well and so effortlessly. No more
plastic storage bins, no more stacking, and no more separating! The
flow-through design is ideal, and the crank makes harvesting a cinch. Thanks
to the Worm Wigwam, I now know how mediocre the other systems I've used
were. Our worms are consistently active and energetic, and our compostable
waste disappears like a ham hock in a piranha tank. One of our co-workers up
by Lake Almanor was so impressed by our Worm Wigwam that she bought one of
her own and raves about how well it's working for her.