keep it dry (speak area). keep it warm. Use some copper-based antifungal in the spear hole and it should recover.

it will take a long time (several months maybe) but it shoudl come back.

Perhaps for next winter, keep it a bit warmer and put the copper stuff in it before overwintering... again, keeping the center dry.

I've heard that putting copper based liguid fungicide into the crown can save a palm from crown rot even after the spear has pulled. I bought some fungicide at a local nursery for $7USD in 24oz spray bottle. I haven't used it yet but its good to have on hand.

btw... I never heard of the princeps variety. What do they look like? Any pictures?

Doug

Here is a link Doug. Not much known about the Princeps except they are found only in a couple places in western China and said by some who have seen adults that they are the most attractive of the Thrachys and quite cold hardy. If you can find one they will be quite pricey and even the seeds are 6 to 7 times the price of most of the other Thrachys. Below is a pic of some in their natural habitat.

Here is a link that might be useful: princeps