purple???

hi, im growing some afhgan X special skunk outdoor, about 2 weeks into flower...on a few of the shoots on each plant, the pistols, leaves, and entire shoot really is turning purple. not like a patchy purple, but a thick true purple color, but only on 1 shoot per plant, is it mold or some disease perhaps or a deficiency??? i haven't seen it before...what y'all think? ill get a pic if neccessary, but i tried to describe it like i see it...this strain has never been grown before, its my own breed. the parents were amazing, a 10 foot tall mountain mist(himilayan indica X special skunk) female with a pure afhgan male. they were amazing last year, so i hope there off springs will dominate as well...whats up with the purple though?, i KNOW its not the genetics...

how cold are your nights?

if its not the genetics phosphorus deficiency usually explains the purple, your description sound quite extreme however

yeah, its probably just the cold, i should have realized 40 f at night and 85 f during the day is going to cause some purple. thanks guys