I'd say around five or six...No flower yet, still vegging. I did read a bit and was thinking maybe nitrogen def...It's been nearly a week since last nutrient(miracle grow 15-30-15...But I indeed do have purple stems on three or so of the older nodes. The newest one stems are turning nice and green. But yeah, do you think it's worth a try giving them a bit of nutes and seeing if any improvement comes from it?