Lychee tree -Melbourne frosting

MelbFruit says...
So you scratched the stems and the stems are still alive (green under the bark)? Did you water properly? I have kept mine in a greenhouse ($50-100 at Bunnings depending on size) for about a month now that it has gotten cold, and my lychee trees are fine (not great, but fine). You might need to bring the plant indoors at night or secure the frost cloth so the wind is not bowing in from underneath. Probably your best bet for recovery is keep it alive till the spring and see what it does.