I'm a new grower and I have an outdoor female who's in full bloom. Over the past few weeks I've noticed the fan leaves slowly starting to turn purple and black. First it was a few, now it's 3/4 of the plant. The buds, however, are still nice and fluffy and green. The nights right now are getting to be around 10 degrees Celsius (50 degrees Fahrenheit).
Should I be alarmed by this? I've got about another week to go.