I see this all the time, too. They are are quirky little critters. I tend to let mine get overgrown in containers. Some, in the sun too much will literally ball up, turn red and go dormant. I have taken these, separated and repotted them, and literally within minutes they will start to open up and change color. Also, I have a NOID that my sister and I have passed back and forth for the last 25 years. It only likes the sides of strawberry jars. It doesn't like the top and doesn't like pots. Go figure.
I totally agree that there are alot of different factors. Just watch them change color and open up after a summer rain. I don't think there is a pat answer, because, sad but true, different varieties have different preferences. You know, different strokes for different folks.
