Im experiencing a few nanners here and there on a few of my plants. I know genetics have a play in this. My cab can get pretty hot and the temp can fluctuate once I get home to fire up the a/c.
So my question is, can high heat/heat stress cause the odd nanner here and there?
Any kind of stress, including high temps can trigger a few nanners.
I'm stick on your statement "once I get home to fire up the a/c"...
arrgh, it would seem that you wouldn't be having a problem if you left the a/c on when you leave eh ?
Having a good constant intake and exhaust running in that cabinet will also help keep it from heating up. But, I'd suggest both, good air flow through the cab, plus NOT turning off the a/c whenever you're going away.