Brown spots on large fan leaves

Cannabisfan · Mar 3, 2020

Hey all, new to this site/growing and looking for a little help. I’m growing northern lights auto, and it’s in week 3 of flower, two large fan leaves look like the picture below. What do you think the problem is and how to I fix this? Also my feeding schedule I’m following is posted below as well. Thanks!

DreamsOfDiesel · Mar 3, 2020

Please post pic with real lights so we can see colors of leaves better

Cannabisfan · Mar 3, 2020

Cannabisfan said:
Hey all, new to this site/growing and looking for a little help. I’m growing northern lights auto, and it’s in week 3 of flower, two large fan leaves look like the picture below. What do you think the problem is and how to I fix this? Also my feeding schedule I’m following is posted below as well. Thanks!

Note the chalky residue was when I sprayed cal-mag after covering flowers since my original thought was calcium deficiency. Only 2 large fan leaves are like this.

Cannabisfan · Mar 3, 2020

DreamsOfDiesel said:
Please post pic with real lights so we can see colors of leaves better

Hey thanks for the response, below is a picture of the affected leaf.

DreamsOfDiesel · Mar 4, 2020

Soil or water or coco or other? I use soil & gh flora but my feeding is lot more than yours. 2 tsp micro, 3 tsp bloom, 1 tsp grow per gallon plus 5-6 tsp medicino calmag. I've also never run autoflowers, they may be different. They look deficient of p or k to me

Jack og · Mar 4, 2020

Potassium def, and signs of media being too wet if in media, if in hydro, check the roots what color are they and is there a stagnant pot/ res

Cannabisfan · Mar 4, 2020

DreamsOfDiesel said:
Soil or water or coco or other? I use soil & gh flora but my feeding is lot more than yours. 2 tsp micro, 3 tsp bloom, 1 tsp grow per gallon plus 5-6 tsp medicino calmag. I've also never run autoflowers, they may be different. They look deficient of p or k to me

Thanks for your help, and this is organic soil mixed with a good amount of perlite.

Cannabisfan · Mar 4, 2020

Jack og said:
Potassium def, and signs of media being too wet if in media, if in hydro, check the roots what color are they and is there a stagnant pot/ res

Damn maybe not enough drainage in my bucket! I’ll have to see if I can drill more holes for that. I’m using organic soil and I added a good amount of extra perlite. I’ll get that potassium under control, thanks for the advice!

Brown spots on large fan leaves

Brown spots on large fan leaves

Cannabisfan

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