This is what I plan to do with about 8 Chinese Pistachios that popped up in my front garden. They're currently residing in a styro box to mature and obtain the right pot.
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Enthusiasm on Fire is Better than Knowledge on Ice
Regarding the colour, one trick I find helps is to keep the trees under about 70% shade during say Feb and March and this somehow keeps the leaves a bit softer. Then once they go out in full sun again in late March - April, they colour up quickly and evenly. Also, where I am the nights go down to about 6 pretty regularly which is lower than some other places around here. I'm in a kind of valley.