@kpixtv: She’s known as “The Cannabis Gardener.” Think Martha Stewart with an extra green thumb. Penny Barthel of Albany has been growing herbs in her tiny backyard garden: basil, mint, rosemary, the classics. And she can add cannabis to that list. It started as a favor for someone battling cancer. Dan Mar, who runs the Cannabis Studies Lab at Cal Poly Humboldt, said as the stigma fades and laws change, more people are growing clean, chemical-free cannabis at home.