Answer: For a quick and inexpensive cover in newly excavated areas, use crownvetch (Coronilla varia). As that fills in the first year, check into the many other options for ground covers (albeit slower) in Colorado. For shade, I'd suggest closely planting amix of fast-growing trees (such as the many kinds of Poplars that do well there) with the more desirable but slower growing trees such as firs, maples, oaks. When the slower-growing trees reach an acceptable size and fill in, cut down the fast (but trashy) trees.
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