Small spots on new plant growth

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Baystatestank

Member
I'm hoping to get some ideas about what could be causing these brownish spots on my plants. It started on the lower leaves but has spread up in quick fashion.

I'm using Jacks 321, 3 for the Jacks, one for Epsom and 2 for the Cal nit. I grow in coco so they get a feeding once a day. My humidity was @60% before, but I've since turned it down to 50%. My light is the apprpriate distance. Airflow should be fine but I turned my little 6 inch fan off to begin these plants but decided to turn them on yesterday, far above the canopy. I'm in the cold north growing in a basement that stays at a consistent 60 degrees. I have my tent on a wooden platform with some insulation above the platform but underneath the tent. The root zone is genrally betwee 58 and 65 degrees, typically around 63. These are clones I got off a buddy and he told me he got some slight powdery mildew but washed it off with a baking soda mix.

I'm guessing it's the cold or that I should up the jacks to the 3.6, 2.4 values recommended by Kootmed? These are 3 or 4 week old plants, from when the cuttings were taken.

If I missed any data that would be helpful with diagnosis please let me know. I'm trying to solve this early before it gets worse.
 

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D586

Active Member
Brother , get a hid light for veg. Plants want 80 degrees in veg. You need a metal halide light for veg to keep you area warm. You'll be walking around in underwear in the artic with a couple metal halides going. I would suggest 1000 w because you can always dim them to 50 percent. They hate the Temps. I only feed every other time as well
 
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D586

Active Member
Growing in the cold and having hid is a must. Dehumidifiers help a little with Temps. 60 is way go low.
 
MannyPacs

MannyPacs

Well-Known Member
My plants have never liked 321 in particular in veg and I always got better growth with 221. I use tap now so I just do 22. I think it's the high K levels throw things out of balance. I've got the numbers somewhere but the 22 ratio brings you more in line with what h3ad was doing
 
Boatguy

Boatguy

Well-Known Member
Baystatestank said:
I'm hoping to get some ideas about what could be causing these brownish spots on my plants. It started on the lower leaves but has spread up in quick fashion.

I'm using Jacks 321, 3 for the Jacks, one for Epsom and 2 for the Cal nit. I grow in coco so they get a feeding once a day. My humidity was @60% before, but I've since turned it down to 50%. My light is the apprpriate distance. Airflow should be fine but I turned my little 6 inch fan off to begin these plants but decided to turn them on yesterday, far above the canopy. I'm in the cold north growing in a basement that stays at a consistent 60 degrees. I have my tent on a wooden platform with some insulation above the platform but underneath the tent. The root zone is genrally betwee 58 and 65 degrees, typically around 63. These are clones I got off a buddy and he told me he got some slight powdery mildew but washed it off with a baking soda mix.

I'm guessing it's the cold or that I should up the jacks to the 3.6, 2.4 values recommended by Kootmed? These are 3 or 4 week old plants, from when the cuttings were taken.

If I missed any data that would be helpful with diagnosis please let me know. I'm trying to solve this early before it gets worse.
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You definitely need to get your temps up, and consider feeding more times per day.
My basement temps are similar, but inside the tent it is in the low 80's lights on.
I run my exhaust based on temps, so it is not running 24/7.
 
amneziaHaze

amneziaHaze

Well-Known Member
whats your ph?
looks like a deficency since it started on the bottom leafs. maybe calcium? could be that your ph is just too low
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hotrodharley

hotrodharley

Well-Known Member
Get those leaves off the medium. LED is fine but temperature needs to be up around 80. They’ll survive at 70 but they won’t thrive. Calcium deficiency deficiency appears on newest growth. Not on older lower growth.
 
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