Gardening doesn’t have to be an expensive hobby. “I didn’t spend one cent on this garden,” said Dave Derner, who created a backyard retreat at 1088 Elmwood Ave., Buffalo, where he lives above Half & Half Trading Co. He got plants that nurseries or co-ops were going to throw out. Friends gave him plants as well. Many of the plants flourished. “I just put things in and let them grow,” Derner said. “It’s amazing how things just want to grow.”…
