Its legal status and wide range of uses make marijuana a tough plant to regulate — or even to advise farmers about. Here, young marijuana plants are seen at a growing facility.
Using chemicals to control bugs or mold is common among commercial cannabis growers. But with no federal oversight, experts are concerned growers may be using dangerous pesticides.
Ted S. Warren/AP
Leaders of the Alaska Cannabis Club share a joint at their medical marijuana dispensary in Anchorage. On Tuesday, Alaska became the third state in the nation to legalize recreational marijuana use.
Adam Eidinger, chairman of the D.C. Cannabis Campaign, puts up Initiative 71 posters in October. The measure to legalize possession of up to 2 ounces of marijuana was approved by a wide margin of local voters.
Nebraska and Oklahoma say Colorado's marijuana law is unconstitutional, in a challenge to the law in the Supreme Court. Earlier this month, visitors from Texas smell marijuana at the Breckenridge Cannabis Club.
Volunteers with the DC Cannabis Campaign (left and center) talk to a voter on Election Day about the ballot initiative to legalize marijuana. The measure was approved, but its fate remains uncertain.
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