Organic standards are regulated federally by the US Department of Agriculture and marijuana is still illegal at the federal level. The organic label in Colorado would have to be state initiative.
And really because labeling of cannabis cannot be enforced by the federal government, right now marijuana producers can put any label on their product that they want.
There have been calls for a more highly regulated labeling and dosage regime among legal marijuana states, most loudly by the Nevada Cannabis Distributors Association. Their call, which makes the most sense, is for cannabis