Bernie Ortwein (left) and Karen Semmelman enjoy a glass of wine on their roof deck in the North End. The pair is in just their second season on their roof deck but already they can’t imagine living without it. In 2006, the couple moved to the North End from the Chesapeake Bay area, where they'd gardened on 3 1/2 acres of waterfront property. “I knew a lot about traditional gardening in the ground,” Semmelman says. “We knew nothing about gardening in containers.”