john_ny

I don't know how long ago the damage occured but I will say that you probably have to wait a few weeks, or months, before you can expect to see new growth.
I brought a dwarf lemon back from Orlando, in the end of September. We cut it back quite a bit, so I could fit it in my bag. After several weeks, it put out some new shoots, at the top. Now, a little over three months later, I noticed a new little shoot coming from below the graft. I will try to save it, and air-layer it, because I want the dwarfing root-stock. (Poncirus trifoliata)
You might try to make a little scratch in the bark, with your fingernail. If it shows green, it's still good.

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John