I thought so too, but have done repeated side-by-sides. Indica's were less prone to heat stress, and no adjustments of nutrients necessary. The already nutrient-sensitive sativa's are easily overnuted under the same heat stress. I still grow 'em both during the summer on occation, but with the full understanding that sativa dom's just don't look like they handle it as well. Strangely, no real difference in taste or quality though. (after curing, of course)

Perhaps it's a genetic reaction to UV light thing:
Structure-function relations of warm ... - Google Books

Maybe this is why UV light affects our cannabis plants differently (different mixes of strains equals differeent results...?) But that's another topic. :thumbsup: Notice the mentioning of dead trichomes adaptations and light absorption or reflectivity...? Not at all sure what it would mean for cannabis, but who knows?

If you scroll down on the page to Section 2.1.2, it addresses the ability (or inability) of a plant to deal with heat. Doesn't mention a tropical temperate climate plant in an arid enviornment, though. Nor does it address an arid plants ability to shed water (avoid mold) in a humid enviornment. l really don't know much, other than what has been working in my growroom.

2.2.1 addresses arid-climate plants. This is where the narrow-leaf for arid (hot?) climate understanding comes in, but there are plenty of narrow-leaf plant species found in tropical/temperate regions too. Cannabis isn't necessarily an arid-climate plant, soooo...IDK.

I read this technical shit and it get's my mind going in a thousand directions. Time for some aspirin and a nap...
Sure wish someone would fund a legitimate cannabis biological research institute. I'd volunteer to be the custodian. (or perhaps the customer relations officer?) :jointsmile:

Sorry about the hijacking...