over-watering. yuccas (with no k's) do not like a lot of water, they like hot dry conditions. I have been taught by the master. well the mistress. i am right aren't i apricot?
Ermm actually they come from the tropics where it rains regularly but in this country I suspect darth is right. Just keep it drier but mist it every day and it should recover. Just exactly how did this yucca thing get associated with me in the first place?