- There are many ways to invest in legal cannabis. Yes, there are the grower/dispensary models, but there are also wholesale grows, and derivative products from flower. There is good money in leasing warehouses, providing security systems and teams, cash transport and storage, packaging, cleaners (especially for extraction machines), and more. A good idea might be to attend the Marijuana Business Conference and Expo. A great publication to follow the industry is Weed Week.