Mixed ponderosa and lodgepole pine, at 200yrs, after fire. N.B. regeneration in opening. Antelope Tree Farm of Weyerhaeuser SE. Oregon.

Ponderosa pine 250 years showing ranges on health evidenced by crowns -vigorous to debility. Coconino National Forest. Flagstaff, Arizona

Ponderosa pine 250 years showing ranges on health evidenced by crowns -vigorous to debility. Coconino National Forest. Flagstaff, Arizona

Ponderosa pine 250 years, Coconino National Forest. Flagstaff, Arizona.

Pine and shrub hill

Ponderosa pine at 54 years. thinned at age 43 years to 50sq.ft/acre. Taylor Woods. United States Forest Service Flagstaff.

Ponderosa pine at Weyerhaeuser's Antelope tree farm in SE. Oregon N.B. pine regeneration in openings following past harvesting.

Ponderosa pine at Weyerhauser's Antelope tree farm in SE. Oregon. N.B. pine regeneration in openings following past harvesting.

Ponderosa pine in greenhouse at Jefferson nursery. Ponderosa pine, 1+0, container. Weyerhauser.

Ponderosa pine in open area, logged and with bark beetle damage. N.B. no regeneration. Near Princeton.