Japanese Maple has lost it's leaves

[shibui]

Same thing happens here. Some still actively growing, others in full colour and others have already dropped leaves. Sometimes it is individual difference, sometimes conditions - subtle difference in watering, sunlight, temp, etc and the differece can have occurred a month or more ago.

[MoGanic]

Ahh I see!

That makes sense. Thank you . (P.S check out the pictures! I accidentally posted the same comment twice and couldn't figure out how to delete one, so I just edited it haha, they're back on page one!)

[kcpoole]

I thought it made sense for them to drop their leaves! But then why is that one Maple growing NEW leaves ??

Can be Just a Weird tree, but if they are all very young they will not have settled in to the correct seasonal routine yet. all babies take a few years to become "normal"
sprouting at the wrong time need not be anything to worry about and they will get cold and drop soon.

Ken