Help ! We have had a ponytail palm in the backyard for 13yrs.Up till this winter I've been able to wrap it & cover it in blankets during any freezes,(usually short-lived),& never had a problem.This winter was different, plus combined w/an extended freeze.The palm had reached nearly 15 feet in height,& though I did my best to cover the expansive fronds,& wrap the two main stems & base, It had some freeze damage.I lost all the fronds,& the stems are damaged,(wet spots & some seepage).The base,a ball of nearly 3 feet now!-is fine. But should I prune the stems at the 'dry line' to prevent further damage creeping into the good parts-or what? I would hate to lose this really cool plant.I've got several months now,to figure out some sort of framing system to support blankets & comforters,& a temporary source of heat to keep this from happening again. Any suggestions & advice would be greatly appreciated-Pat.