Welcome to Windmill Gardens The goal at Windmill Gardens is to make everyone’s special day at the nursery a perfect one. Discover your own garden lifestyle at Windmill Gardens. We make it easy, exciting, and an adventure in your own backyard!. Your destination for garden inspiration...Full Service Garden Center in Sumner, Wa nestled within a village of shops. Stroll through our gardens and watch as each new season brings new gardening inspiration.