I think this one may be related to:
https://answers.ea.com/t5/Bug-Reports/UNSURE-Plants-change-quality-on-their-own-evolve-on-their-own/td-p/9185453
I had it yesterday on plants that had been devolved from Perfect to Magnificent by a jumping Eco Footprint, only to notice I could not evolve them back to Perfect. But of course once the Eco Footprint realized a day later it was actually supposed to be green, it went green and all the plants were Perfect again. And yes, this only happened for the plants in the vertical planter.
They also sometimes turn into a harvestable in the planter, but the next cycle they are back to being a plant. Doesn't bother me.
@SimGuruNick Can you confirm or deny that changes in the Eco Footprint causes plants to auto evolve or devolve? Or at least if that was the intent or not? If so, I would obviously really appreciate if you could also point me in the right direction of the tuning file to mod in order to turn off that "feature". Thanks!
I still remember it took my sims almost an entire life stage to evolve plants up to Perfect. Now it happens within three sim days. Ah, the good old days of Discover University. 😉