Hi, to set a diagnose i got to ask a few questions. Atm it looks like ph fluctuations/ not optimal growmedium. So wich soil didi you use=? GIrls have changed drasticly in showing spots, discoloration AAAnd burnt tips. My tip is / (not knowing what medium you grow) You are using a unoptimal soil for growing MJ. I think your soil is to Hot " rich" and soes not have a good ph range for your Plants.... So if you write me back wich soil you use we can exclude some reasons