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Last year I had several decidious trees not turn to changing leaf color and only when the frost came and killed the leaf did they turn brown. They then held their dead leaves most of the early winter. Why did they remain green, not change color and drop their leaves?
Acer saccharum
Parrotia 'Vanessa'
Acer Glabrum
Cornus Alterfolia 'Joyous Summer'
I wonder if I need to stop irrigating to let them get stressed? I have matching specimens that did what was expected of them. It seems the ones in the sun and were growing well were the ones that did this. Except the Cornus. They all have been here for several years except the Parrotia.
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