Hi, Rebecca,
So sorry to hear about your Cordylines. Many people around the country are experiencing the same sort of trouble - this past winter was too cold and if the soil they were in was waterlogged, that makes it even worse. To top it all off, the purple-leaved cultivars, including your 'Sunrise', are more susceptible to frost damage than green-leaved cultivars. Since the weather is warming up, you can cut off the dead leaves. Don't cut back the stem until you (hopefully) see new shoots either along the stem or at the base. Whilst in the process of cutting back the dead leaves, take note as to how the main stem feels. If it seems mushy at all, especially in the centre (you'll probably be able to tell this once dead leaves are gone), I'm afraid its gone.
Kathy C
Replied: Tuesday 12th of April 2011 05:41 PM