Sorry to jump right in without introduction, I have lurked here for a while and learned a lot in the last year. I was hoping someone could look at this and tell me what the gray spots might be on these leaves. This is my first grow and I have 4 plants, but only 2 have these spots.. The plants are 3 weeks old today and are growing indoors under CFL bulbs. I water every 2-3 days as needed, and I determine when it's needed by pushing a little wooden dowel in the soil to see if it's dry. The water ph last night was around 6.2-6.5 and they are growing in Miracle Grow potting soil.
I'm honestly not sure but I'd probably say it has something to do with your soil. And knowing this forum majority of people will have a go at you for using mg haha but yeh sorry bud not sure. Good luck though.
Yeah, I know, don't care though. I'm not expecting usable product from these plants. These are starter/learning plants. I figured I would learn all I can about lighting and watering from bag seed then I can do the next grow properly.
Yeah I just did some more research, man. Looks like downy mildew. Google it and you'll see. Source: Fuzzy Grey Spots growing on Leaves - Page 2