I was under the impression that ume were hard / almost impossible to air layer. I've bought some Prunus whips to root graft. Please post your results - I'd be really interested if it takes.It is so beautiful with one flower!!
Sorry, please let me post one picture here. I am planning to do airlayering on my grafted ume next year. The remained one will look similar to your tree later on
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OK, I am out of here. Thanks for understanding, Fredtruck