March is the month to buy stocks that could profit from the U.S. cannabis industry. Why? The clock is ticking for big states to launch their recreational marijuana markets. And there's a pretty good chance of major federal cannabis reform as well. Buying now gives investors an opportunity to eventually realize big gains.

But which stocks are the best picks? Here are three top cannabis stocks to buy in March from across the industry. 

Let's start with one of the largest multistate cannabis operators in the U.S., Cresco Labs(OTC:CRLBF). The company ranks as the largest wholesaler of branded cannabis products. It also operates a growing chain of retail cannabis stores.

Cresco is firming up its position in the states where it currently operates. For example, the company recently closed its acquisition of Verdant's four medical cannabis dispensaries in Ohio. It also won a license to begin selling recreational marijuana in Arizona, which just opened its adult-use market; Cresco already sold medical cannabis in the state.

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