I have 3 Cordylines (of the red leaved Variety) one is about 12-15ft high. This one I am worried about it is losing it's bark along quite a lenght of the trunk also the top is looking brown and dead. It has a lot of new growth around the bottom of the trunk, and new growth sprouting out of the trunk to about 3ft high alas one or two of these new growths now appear to be dieing. Any Ideas PLEASE??