I would visit Chase Gardens in Orting (www.chasegardens.org) to see not only heather but other choice plants for color as well. This is a show garden open to the public that has docents that can educate you on where to find the plants you want. Nearby is a small nursery called Old Goat Farm (www.oldgoatfarm.com) where you can buy hard-to-find plants that do well on slopes in your area. Enjoy the research and keep growing, Marianne Binetti