Five years and two cameras ago:
At the time, it had been planted in that spot at least a couple of years, if not longer. It's reasonable to say it was a well established plant at death. Up until a couple of weeks ago, it looked consistently gorgeous and healthy. Now, suddenly, kaput.
I'm surprised, and wondering what did it in. The one unusual condition of late were the two significant summer rainfalls we got, the first from Tropical Storm Dolores, the second from Tropical Storm Linda. Did warm-weather rain enable a bloom of soil-based bacteria that caused root disease? I'm baffled--a long-established plant cannot be blamed on weakness due to lack of a root system, or sloppy growmanship by the original grower, pre-purchase. I've never done anything for that plant since I planted it except admire its beauty. No fertilizer, no extra water, zilch.
There was a cluster of new foliage emerging; I touched that, and it came off in my hand. It died much faster than it grew. It's taken more than seven years to get as tall as I am. Well, that's gardening, ain't it?
I dug out three Yucca 'Margaritaville' last October from the west slope with much painful effort, and they've been sprouting new plants ever since with great enthusiasm. Another Yucca, 'Color Guard' always looked unhappy, so I pulled that out several years ago, careful to get all the roots I could find--and it's back, at linearifolia's feet.
Yucca 'Color Guard', after being removed:
Maybe if I wanted to keep it, I should have dug it out. See how I mourned it here.