This my second plant, which I donÂ´t know itÂ´s Strain, I have another which is a Purple Urkel, with perfect green stems. This one, has purple colors stems and I donÂ´t know if is P deficiency or just a natural strain characteristic. Natural Sun Ligth, Rain Water 100%, PH 6.8, Nuts, 10/50/10 once, 3 weeks ago. I noticed the purple color in preflowering, didnÂ´t remember if was that color during veg, because I didnÂ´t know that can happen. Otherwise the plan looks healthy and growing. Thanks for your advice.