Thhis year a buddy of mine grew some farm dope seeds we found, some of the plants looked pretty nice and had bright pink hairs and purple spots on the buds. Then when he cut them and dried them the pink spots just became very dark. the final product was just dark bud no pink or purple, smelled fruity though. And i grew some Chronic X White Rhino that i left out until october 15th ( in central ontario), the buds were a nice light green, then when the colder night temperatures and a few frosts the leaves and some parts of the buds turned a really nice dark purple. So that is one way let them get cold.