Potassium deficiency.?

My girls are about 4 weeks in to flower and I have not been feeding to much ,looking for a clean burn since I am mostly growing for my bro who has a severe seizure disorder not controllled by meds
I was just inspecting the leaves and found this
I think potassium ?
Support info
Outdoor grow 10 g pot
Coast of Maine soil
Feeding for big grow, big bloom and Buddha bloom
This plant is cbd hash plant
Watering with rain water only not testing ph

Should I flush ? Mega dose with fert ? Any help would be appreciated

1 Like

@Chinacat Testing pH runoff is a must in cannabis growing…

It’s look more like calcium deficiency or Manganese one , imo. …

Wait for others opinion, tho…

Al is right is you are in pots outdoors you need to pH the water you are mixing your nutrients with, after you mix the nutrients!

Please don’t do anything harsh as that will cause worse problems! Mega dosing fertilizers is never a good idea.

Are you following the manufacturers feeding schedule for your nutrients? @Chinacat