My plant is changing colors kinda? It's been cold as shit during nighttime here in AZ the past week about, pretty nice during the day too, 87 88 with cool breeze.. I'm on day 50 flower.. was gonna chop it yesterday but decided to wait til Monday.. It's OG kush, the plant has purple stripes since veg and has straight purple stems on fan leafs.. My other plants stems are purple as well.. Both all outdoors no indoor. What you guys think? Root problem? Should I chop it now to salvage it?