The biggest crop-related issue today is not what might happen in the upcoming farm bill; rather, it is what occurred yesterday at the Department of Justice. Attorney General Jeff Sessions rescinded the so-called Cole memo, issued by then Deputy Attorney General James Cole in 2013, and four other Obama-era directives dating back to 2009 that set guidelines of noninterference/nonenforcement regarding federal law within states where marijuana was legal. The chart below, detailing the 2016 per-pound crop prices in Colorado, shows why this is a big deal. The value of marijuana in this state was more than 24,000 times that of alfalfa hay.

Sessions’ memo puts recreational marijuana operations in jeopardy (e.g., the 40-acre operation that...