"In one year a mature tree will absorb more than 48 pounds of carbon dioxide from the atmosphere and release oxygen in exchange...It is proposed that one large tree can provide a day’s supply of oxygen for up to four people." (usda.gov)
Colorado Blue Spruce
Height: 50–75', spread 10–20' at maturity
Growth: slow to medium rate; 12" to 24" per year.
Requires normal moisture with moderate tolerance to flooding and drought.
Provides food and shelter for many bird species
"It was not until 1862 that this spectacular species was discovered growing in enchanted meadows and streamsides high up in the Rocky Mountains. Once found, the fame of this blue spruce spread quickly, and today it is one of our most widely planted landscape trees [nationwide] as well as the state tree of Colorado" (arborday.org)