I have a few apple seedlings that I’ve been growing in my office over the past few months. They are doing very well but the time is quickly approaching where they should be going dormant.
My question is how long will they need in an unheated sunroom (north side of my home so “shaderoom” is a better descriptor) in order for them to harden off? Most of my outdoor trees hold their leaves well into December so I’m assuming that I can hold off on moving them until early October.
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Wow! Good luck they are a real promiss! 
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