Phormium advice please!

I'm not sure that this is the variety I have - it is approx 5 feet tall and wide and in a gravel bed. It is a lovely specimen, but yesterday I removed loads of leaves, many of them centrally-located and many of them rotting. Should I now use a fungicide? Some of the orange surface roots are now exposed. Should I protect them this Winter - and if so, how? And do I need to "fill" the centre?

Re: Phormium advice please!

Reply from Louise Yates M.A.

Any chance of a picture? That would really help figure out the situation!