Hi there, I have a citrus tree (a couple of years old, the trunk is about 4 cm thick in diamater) that froze overwinter in a pot... I thought it is gone, but there is one little branch which is growing out from the base of the rootstock, below the graft, and that particular branch has been green for months now, unlike the rest of the tree - all the other branches are yellow/brown, apparently dry and dead. I left it out on the garden so it gets occasional rain and moisture throughout the pot, but since I took it out from the wintering room, there hasn't been any growth, no new buds, nothing. The little branch is still green though - does that mean that it is still alive?