Kent,
United Kingdom 
I have grown a canadian acer from seed. At about half a metre in height the growing tip was nipped out,there are now two branches growing on strongly competing each other for height forming aYshape. Should I prune the weaker one off or leave it alone ?
Cheers
Jim W
26 Jun, 2013
Answers
A Canadian Maple is going to want to get big no matter what.
26 Jun, 2013
If you are shooting for a tall tree, pinch the tip out of one, and stake the other one as a new leader. If you are trying for a largish bonsai, or tub tree, pinch the tip out of the stronger one, and cut the other one back by half, to start training a strong and character-filled structure. Note that Moon_grower is right: unless it is a Vine Maple from British Columbia, most Canadian species of Acer are, by nature, strong, tall trees, and may be hard to keep garden sized.
26 Jun, 2013
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It depends how you want it to look. I'd be inclined to nip the growing tip out of both to make both branches bush out to give a more attractive shape.
26 Jun, 2013