good question, I would like to know too. I just overwintered mine outside the past winter and since I brought it indoors a few weeks ago, it has leaved out but only on the lower trunk and it seems the rest of the tree up top is dead. I wonder how everyone elses's are doing? We had a harsh winter in our region.
One observation, I scraped the bark on the trunk that appears dead and got to see a layer of pale green to yellow color which quickly turns brown where as on the lower trunk that's definately alive it's bright green and juicy if u know what I mean.
ficus, maple, elm, juniper, pine