Your HOA must allow its residents to use Xeric landscaping. C.R.S. (§ 37-60-126, et seq.) states that HOA’s are prohibited from creating restricting covenants that forbid xeriscape or drought tolerant vegetation or require ground covering consisting of only turf. You must still follow the town laws put forward in the Unified Development Code (UDC), so you can’t cover your entire lawn with rock or concrete.