Brown spots forming on some large fan leaves

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cannabisfan83

New Member
I’m new to growing, currently week 3 of flower with northern lights auto. Can someone PLEASE shed some light on what this is and what to do? Below you will find a pic of a leaf and what my feeding schedule I follow. Any info is appreciated!

FYI 600 watt full spectrum grow light, humidity 38% temp 76F light is 20in from plant.
 

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shiva71

shiva71

Well-Known Member
A pic of the whole plant helps too :)
If it's just one or two larger fan leaves then relax. Absolutely normal that they start to deteriorate as the plant puts all its effort into flowering.
 
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spek9

Well-Known Member
shiva71 said:
Absolutely normal that they start to deteriorate as the plant puts all its effort into flowering.
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Not at week three it isn't. If deficiencies are appearing at week three, something is wrong.

This looks like it may be a calcium deficiency, but it's hard to tell because the plant appears to have been foliar sprayed with something (all of the white circles on the leaves).
 
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cannabisfan83

New Member
spek9 said:
Not at week three it isn't. If deficiencies are appearing at week three, something is wrong.

This looks like it may be a calcium deficiency, but it's hard to tell because the plant appears to have been foliar sprayed with something (all of the white circles on the leaves).
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I sprayed with some cal mag, but covered the flowers since I thought it was a calcium problem. Only two large fan leaves are being affected, the rest are fine. Thank you all for your help, I will wait and see if the Cal-Mag does the trick. Always good to have outsiders perspective!
 
Tangerine_

Tangerine_

Well-Known Member
cannabisfan83 said:
No, I covered the flowers and sprayed with cal-mag Incase it is a calcium problem, wanted it absorbed as fast as possible to correct any problems.
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ahh ok. Gotcha.
Just for future reference. When foliar feeding, it helps to use a surfactant to reduce the surface tension for better absorption. That way you don't have big droplets sitting on the leaves. A drop or two of dish soap will work in a pinch but don't use anything with antimicrobials or scented.

A lot growers use saponins like yucca when watering too. Same idea, same purpose. Its helps with absorption and prevents dry pockets in the medium.

Saponins foam though, so careful with aero/hydro use.
 
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cannabisfan83

New Member
Tangerine_ said:
ahh ok. Gotcha.
Just for future reference. When foliar feeding, it helps to use a surfactant to reduce the surface tension for better absorption. That way you don't have big droplets sitting on the leaves. A drop or two of dish soap will work in a pinch but don't use anything with antimicrobials or scented.

A lot growers use saponins like yucca when watering too. Same idea, same purpose. Its helps with absorption and prevents dry pockets in the medium.

Saponins foam though, so careful with aero/hydro use.
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Awesome, thank you! First plant is a learning experience no matter how much I read ha ha.
 
Renfro

Renfro

Well-Known Member
cannabisfan83 said:
I’m new to growing, currently week 3 of flower with northern lights auto. Can someone PLEASE shed some light on what this is and what to do? Below you will find a pic of a leaf and what my feeding schedule I follow. Any info is appreciated!

FYI 600 watt full spectrum grow light, humidity 38% temp 76F light is 20in from plant.
Click to expand...
What medium are you potted in? What is your pH running?
 
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