What sort of Acer is this?
in Plants

I planted in under cotoneaster trees, and it's grown very slowly, and is now about 4' x4', but I'm thinking of moving it, to a north facing border area behind a 2 1/2 ft wall, where it's bottom half will be in shade, but top half in Sun, so an ID would help with this decision.
can anyone help?
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I strongly doubt anyone on an internet forum would be able to help you identify an Acer from that photo.. I do hope you manage to find out in due course... very best wishes...
A basic answer is Acer palmatum.
Whether it is a named cultivar is impossible to say.
If it was a special cultivar it would be grafted.
Acer Sango Kaku leaves are 7 lobed not 5 and are quite fancy.
See pics below of Acer Sango Kaku leaves in spring..
Acer palmatum Sango Kaku is a fantastic Acer.
Common name Coral bark Acer.
Easily recognized by red branches....we do not even see any branches!
So no idea how you reach that conclusion.
https://www.google.co.uk/search?rlz=1C1CHBF_enGB785GB785&biw=1920&bih=938&tbm=isch&sa=1&ei=p33TW4WeNI-00gWx-bmoBQ&q=acer+palmatum+sango+kaku&oq=Acer++palmatum+Sango-Kaku.&gs_l=img.1.0.0i30k1l3j0i5i30k1j0i30k1.11383.15211.0.16896.10.10.0.0.0.0.95.743.10.10.0....0...1c.1.64.img..0.10.740...0i7i30k1.0.a9UuVu8gMFE
Even the real experts struggle to id them.
It involves leaf shape, leaf size, colour in spring,summer, growth habit, growth rate, bark etc etc
Acers are wonderful.
I love them.
We used to grow nearly 250 different sp and named Acer trees.
Yet very very rarely do I even attempt to say which one it might be from a single pic showing just a couple of leaves.
Your one is Acer palmatum dissectum...a cut leaf Acer.
It may be seed grown and have no cultivar name.
If it is grafted it may be a named cultivar...but which one I am sorry but I haven't got a clue.
it is clearly very different from the one posted by Super Gardener or Acer palmatum Sango Kaku.