Can my Yucca be saved?
I moved into my house 6 years ago and there was (what I think is) a Yucca, it was a decent sized bush when we moved in:

It has grown considerably and looks fantastic in summer:

But last summer it grew these flowers(?) which I left to do their thing, and now it's looking a bit sad.

Should I cut the flowers / seed head off?
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Yuccas can experience the same sort of damage as Cordyline - you will probably have noticed how many queries on the latter have cropped up on here in the last few weeks.
It's basically a case of checking the crowns to see if they are still alive - if not, you may have to cut the trunks to a level where they still seem viable.
If the base hasn't been affected and the root ball is healthy, it will often send up new shoots.
If that is the case, it may help the rejuvenation if there aren't too many other plants crowding around the base.
However you decide to tackle it, watch your eyes - Yuccas tend to have sharper leaf points than a Cordyline
Thanks, it does have quite sharp leaves but I think it looks a bit more like a Cordyline.
Here's a pic of my Yucca (in flower, flaccida I think)
The trunk was very weak and flexible. I was unable to keep it upright, so I cut it right back. Now it has several new growing points. Weather permitting I will post a pic tomorrow.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
https://www.paramountplants.co.uk/blog/index.php/cordylines/
I lost the top of my cordyline in a very similar fashion in the Winter of 2010 and did the same as described in the article. It did resprout, but a another cold Winter a few years later sadly finished it off altogether.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
If the main stem is is rotten, then you can keep cutting down until you come to a point where life shows.
Even if you have to cut back to just above ground level, if the root ball remains alive, you will hopefully find that new shoots will emerge once the weather gets warmer. You will then have the chance of a multi stemmed plant as opposed to a single stem.
If you have to go that far, it would also help if you cleared some of the plant/grass growth around the base of your plant to give the new shoots a better chance to thrive.