The farther north you go the tougher it is for trees to survive. Eventually you reach the limit. You may find just a few isolated, scraggly black spruce (Picea mariana) hanging on.  Often they are damaged and bare of needles on one side due to wind.  Sometimes, what appears to be number of indivdual trees, are in reality just one plant with several trunks.

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Northern limit for trees

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