i dont think thats true at all.
yes lowering temps does cause SOME purple strains to go purp, but those that do go purp are strains that are predisposed to do so. If you want purple nugs, get purple strains.
alright if you need me to explain, because obviously you do, here.
Lowering the temperatures of ANY plant will cause it to change color, in this case, cause it to change PURPLE.
This is because low TEMPERATURES DESTROY chlorophyll (what gives the plant, leaves, and FLOWERS it's characteristic GREEN)
Chlorophyll is produced during the growing season, and the warmth has a big deal to do with chlorophyll...
now here's something I KNOW you didn't know...
Anthocyanin...
Anthocyanin is a purple/reddish pigment found in EVERY PLANT... This is not only affected by chemicals, but also by the weather...
Cold temperatures destroy chlorophyll, and turn the leaves yellow due to the carotene, but if the temperatures don't go below freezing, the production of anthocyanin is actually better and produces a purple/red plant/leaf/and also in some plants FLOWERS...
then dryness... as in the humidity of the area around the plant,
if it's dry the plants sugars become more concentrated in the leaves, and create a redder tint...
these are REGULAR THINGS THAT HAPPEN TO EVERY PLANT....
so i think this ends our arguement, and i think we both know who told who right : )
enjoy.