I’ve just entered into the late vegetation stage of my first ever Grobo grow of Kosher Kush from Original Kush Seeds genetics.
This is not my first ever DWC grow, but my first time using a Grobo. Everything is going mostly well and I’ve started some LST, but for some reason her lower leaves are showing brown spots and also becoming brittle. I can’t tell if this is due to ph fluctuations, or fungus issues.
I would like to note that I have been supplementing 7ml of cal-mag to see if that helps and I’ve done it on the last two water changes. I’m using distilled water only, so no additional dissolved solids except the cal-mag.
What do you guys think could be the cause of the brown spots?