The 3 to 6 inch cones are borne upright on the stem in the upper third of the tree. Maturing in one season they change from green to purple to brown. In fall the cone scales dehisce (fall off) dispersing the seed. The central axis of the cone remains on the stem. This pattern is true of all firs, not just white fir. In this image also notice the individual cone scales and the leaf scars.
Pinaceae, tree, conifer, cone, needle, evergreen, Abies concolor, white fir