MrsP wrote in news:MrsP.6217f96
@gardenbanter.co.uk:

http://www.gardenbanter.co.uk/attachment.php?attachmentid=12685|

I'm not a yucca expert, but I know that they grow large roots. That plant
is probably horribly root bound. I would poke around in the pot and see how
much root there is in the pot. If it is indeed root bound, repotting it
might fix the problem. Assuming it isn't too late for the plant - you
should have done something a long time ago.