Greenlane (GNLN) Holdings announced it will join the Mainstem B2B procurement marketplace platform. MainStem offers an end-to-end, enterprise-level supply chain solution designed to streamline procurement for the legal cannabis industry. With a network spanning multiple states with more than 50,000 orders fulfilled from every legal recreational state in the lower 48 and Puerto Rico. MainStem connects operators and suppliers through a seamless, data-driven ecosystem.