I'd guess its just a random mutation. I can see from that same bud next to it, the other leaf is fine. So same aged growth is normal. Not something I would fixate over.I have a small young acer butterfly that I bought last year. It's started leafing out, but for some reason one of the leaves is completely different to the others. Any idea why?
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"It should be clearly evident that any new selection suitable for naming as a new cultivar must have such outstandingly desirable and distinctive features that it can easily be distinguished from any other existing cultivar. Discerning judgement must be exercised in selecting and naming a new form. This dictum applies with equal force in the case of dissectums and variegated maples."congratulate yourself on a new cultivar
The other thing is that according to Brent's description of maples variegated and dwarfs is that they can revert for a year or two when grown vigorously or pruned heavy. I hope that's the case because I still haven't seen any variegation on the one I bought a couple years ago. I have been growing it on. According to Mr.Maple if you over fertilize these selections they could revert. Some types could stay reverted. If a variegated tree is pruned heavy after loosing variagation it could come back.