"Catering to people's needs is what we do," said David "Shep" Vache, a 27-year-old Spokane native. "We ask and answer lots of questions." Greenfield Mercantile is currently the only cannabis retailer in Clarkston with certified medical consultants on staff. If a patient needs a medical card, we can produce it. Greenfield is Clarkston's first legal Cannabis store, and we're also known as Clarkston's friendliest. So, pay us a visit. We look forward to meeting you!