Outdoor growers say they have better profit margins and are more eco-friendly than indoor operations. For cannabis growers who plant outdoors, turning leaves signify the fall harvest. During the month of October — colloquially known as Croptober — cultivators throughout Colorado cut down their marijuana fields, the first step in the plants’ journey to reach consumers at dispensaries. Growing outside is reminiscent of the days before cannabis was legal, when producers raised their crop in…