John and Mary Ellen Warchol cannot take a visitor on a tour of their display garden without urging smells and tastes.             “Lemon basil makes a fabulous pesto. Taste,” John says.             “Taste this. The smaller leaves are very flavorful,” Mary Ellen says. “Mmmmm. Thai basil really is different. Spicy,” I agree. I did not taste all 40 of the types of basil the Warchols grow but I gained a new appreciation for the variety of flavors that…