Watch a tree grow in Colorado
The tree is a Ponderosa Pine, growing in the foothills of the east slope of the Front Range.
It was born around 1990 and is growing rather slowly due to the dry climate.
Most of the pictures were taken at sunrise in December and January.
Don't be fooled about the Colorado weather by the fact that all the pictures show snow.
Unfortunately, there is snow on the ground less than half of the time in the winter.