DENVER — Inside a discreet warehouse on this city's outskirts, one of Colorado's largest marijuana companies cultivates nearly 30,000 plants and processes them into products sold at its retail dispensaries.
Workers clad in safety gear shuffle between plants in the Green Solution's facility, treating them and gauging when they'll be ready for harvest and sale. In another room, employees inspect harvested flowers and show off a machine they say can roll 10,000 joints a day.
The Green Solution's smooth-running facility illustrates the maturity of Colorado's marijuana industry, which has generated $14 billion in sales and nearly $2.4 billion in tax revenue since recreational products hit shelves in 2014. But the state's industry is contracting amid cooling demand and a crowded market. Even the largest cannabis companies are feeling the squeeze.
"The problem for Colorado is, there's already too many dispensary licenses. People are going out of business," said Adam Goers, senior vice president of corporate affairs for Columbia Care, a multi-state marijuana company that bought the Green Solution in 2020. "If you have too many people growing and too many people selling, nobody's making any money."

The twists and turns of Colorado's nearly decade-old marijuana industry offer a time-tested look at how legalization could play out in Minnesota. A Democrat-led recreational marijuana bill has already cleared most committees in the Legislature and could be voted on next week.
In Colorado, tax revenue has skyrocketed since legalization, while marijuana business margins have remained tight. More drivers have been cited for marijuana impairment, but teen use of the drug has stayed flat. Some cities have dispensaries at every corner, while others have opted out of the industry entirely.
"If we hadn't been successful in creating this system, I don't think legalization would be in 21 states right now," said Molly Duplechian, executive director of Denver's Excise and Licenses office.
Duplechian defines the early years of legalization as a period of regulatory "trial and error." First, she said, regulators focused on shutting down unlicensed marijuana operations. Then they had to monitor potentially hazardous pesticide and oil-extraction practices.