Posted: 08 December 2012
Overall: Cordylines do need protection in severe weather, I believe it is best to tie the leaves together and then cover in fleece. The trunk is also vulnerable, again wrap in fleece if you can. Don't use bubble wrap or similar.
It is possible to cut the trunk back to more solid tissue.
The plain green variety is hardier than the other coloured ones.
If your tree appears dead in spring it probably is but should grow new shoots from the roots. You don't need to do anything but leave them to grow unless of course you want to propagate more plants from them.
Have patience and wait to see if the trunk really is dead. If it is a simple push against the stem will cause it to fall over.