The leaves on one of my deshojo maples are begining to turn transparent, and in some cases they are turning black at the edges.
The tree was taken as an air layer about two years ago, and is kept in semi shade, but during mid afternoon will receive full sun.
The current temperature during the day is about 14 deg. C, and between 2 and 5 deg C at night.

I feed the tree every two weeks using a high nitrogen fertiliser, and the soil is kept moist.

Any ideas on why the leaves are acting this way ?

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