Premature dormancy of mountain ash tree

Discussion in 'HortForum' started by claj00007, Sep 12, 2011.

  1. claj00007

    claj00007 Member

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    This mountain ash tree is located in Edmonton Alberta Canada - its leaves have already completely changed to a yellow-orange colour (see photo) unlike all the other trees in the neighbourhood. Also it has many green shoots coming up from the ground which appear normal. Is there something wrong with this tree? Should we cut the shoots? And is it a mountain ash tree as I suspect it is?
    Thank you
     

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  2. Ron B

    Ron B Paragon of Plants 10 Years

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    I'm driving by another mountain ash here that looks just like this. In the climate here many other kinds of trees get their fall color early, due to summer drought. Particularly maples. So, without thinking about it too much I've been assuming the one mountain ash here had dried out also. But if a lookalike condition is occurring in Edmonton, where it may not have been as dry, then that suggests another cause.

    Honey fungus? Borers? Or maybe just a species that turns at this time of year normally, grafted onto a different species that turns later.
     
  3. Michael F

    Michael F Paragon of Plants Forums Moderator 10 Years

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    It's a rowan (Sorbus species; Rosaceae), not an ash (Fraxinus species; Oleaceae).

    Looks like something has killed the plant back to ground level (both the leaves and fruit look withered, not just early autumn colours), but it is sending up sprouts from the roots.
     

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