Looks hungry- those yellowing leaves are a bigger problem than the purple stems (which may not be a problem at all)
Whatever you're feeding her,she needs a bit more of it.
Welcome to 420, Keith
? Man that sentence is jacked up but I know spun talk soo lestz tak a crak. Are you saying it’s getting to cold outside and your purple plants need to Finnish growing. Can you bring them inside? It’s not a monster plant is it?