Posted: 20/08/2014 at 14:19
I think that Phillipa is right,being in a lager pot now is too much for it.
they do like a sandy free draining soil . Some of the composts are too cloggy so I add a proportion of pearlite rather than vamiculite...
As far as I know cordylines and Phormiums come from dry sunny places and don't like too much wet.
I have several , some I have had 25 years .these had grown massive I'd split them up loads of times .during the bad winter a few years back I lost them all along with two Cordylines. They went to mush , the six ft cordylines flopped and rotted away.
After tearfully clearing the remains I covered the area with sand sand and planned on replacing. them sick that it would take ages to get thick tall plants.
I couldn't believe it when come summer New shoots sprung up , they grew very quickly and as Autumn approached they were replicas of what I had lost !
The cordylines did the same but will take a lot longer than the phormiums to trunk up.
So even if you lose all the leaves my advice is the same as the others have given .lots of TLC but watch the watering.