The award-winning design encompasses filtered sunlight , cool temperatures and steep slopes that retain snow from September until late spring . Rich alkaline soil combined with a buildup of leaf litter hold significant moisture throughout the summer , which supports the lush Aspen Forest . Meanwhile , ferns , berryproducing shrubs and a variety of native wildflowers including columbine , lupine , geranium and valerian provide a veritable banquet for migratory birds and indigenous wildlife .
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