Joseph Walker has won three collegiate entrepreneurial contests this year for the organic fertilizer that his company OmniEarth is producing largely for commercial marijuana growers serving the fast-growing medical and recreational pot markets.

Joseph Walker says he’s killed his weight in worms.

But after a dozen tries, Walker believes he’s come up with an effective process for encouraging worms to eat — and more important, to poop — and then converting their teeny droppings into an organic fertilizer.

The Brigham Young University student’s main customers are commercial growers of marijuana, a market that’s exploding as more states approve pot use for medicinal or recreational purposes.

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Mike Gorrell ~ Salt Lake Tribune ~