Ya last week of flower add ice to top of media at beginning of every night and get your temps to 60°f. Using ice water can stun the plant too quickly to where you won't get that last hoorah in the last week. If the plants will change colors they will like that not everything goes purple either you'll get highlights and low lights overall giving your bag more bag appeal. Also seems to make them to put out extra layers of resin IME no scientific data but last week shit gets extra caked more than when I didn't autumn off the plants.