Homegrown (1998)

Life is good for Jack, Carter and Harlan, three inept ne'r-do-wells who help run master dope-grower Malcoms flourishing marijuana plantation somewhere in northern California. But then Malcom is suddenly bumped off by a mysterious assailant, after a moment of panic, the naive trio decide to take over the business themselves. However, their lazy days on the dope farm have ill prepared them for the high-stakes game of finding buyers for millions of dollars of contraband. As they plunge into a shadowy new world of duplicity, double-dealing and danger, they soon find that they have gotten in way, way over their heads. But driven on by increasing greed and paranoia, it's too late to back out.