Some mornings, Jim and Linda Happel have a hard time leaving home. Once you get a peek of their tranquil, shady backyard with its running stream, koi pond, towering trees and native plants, you'll see why. You can read about their garden and see more photos tomorrow at baltimoresun.com/gardener. To read a complete calendar of the home and garden events for this month, go to baltimoresun.com/homeand garden