Juniper trees growing in the shade on bare rock are the slowest growing generally.
__ year old little tree growing in shade

What tree?
Well, this one inch tree, sprouting from the rock a few inches to the right of the GPS unit is about
5 feet high and 38 years old.  Behind it a two inch thick juniper, 11 feet tall which is leaning to
 the right also.  It was 34 years old.  In spite of the nearby sunlight on the ground, the sun does
not reach either of these trees for more than about an hour a day.  Consequently they have
almost no side branches and are growing upward towards the canopy as quickly as they can,
 given their lack of nutrients from their rocky setting.