Why does this subalpine fir have no branches on one side? Is it because of rockslides and avalanches? Or wind? Or plant hormones? It appears to me that biologists have not yet come up with a conclusive answer.
What is a tree that lives only in the coldest and harshest ecosystems at timberline in the northern Cascades?
As a rule-of-thumb, most seed cones (female cones) tend to grow in the upper portions of trees. Why is this?