Plants are still reverting. :(

I haven't had any plants reverting after the patch, even on lots that used to have a problem with it. There must be something that triggers it and I'd like to know what it is.
At least it doesn't seem to happen as often as it used to, but I'm afraid for my dragon fruit gardens every time I play. Luckily the families who have dragon fruits are rich and they can deal with reverting plants for some time, but it still makes me nervous.