We have had problems with the super market ones.
Perhaps they were pushed to much.

Maybe it didn't get enough sunlight and not enough food (pushing) to
live.

Hope a greenhouse expert comes in on this - they might be the person to
knows.

Thanks Martin. It is in a place with full sun, so I know it got plenty
of that. There are four plants in my pot, and one of them was even in
the process of making a bloom. I've never had a plant go south so
suddenly before!