Yellowing at 3 weeks flower.

Gorilla Cookies Autoflower from Fast Buds. Yellowing of the leaves. Started giving micro and bloom about two weeks ago. I’m guessing there’s a deficiency. Nitrogen? She’s about 3 weeks into flower. She’s 45 days old. Medium is 50/50 FFOF/Perlite.
 

Attachments

  • IMG_7913.jpeg
    IMG_7913.jpeg
    2.4 MB · Views: 34
  • IMG_7915.jpeg
    IMG_7915.jpeg
    2.1 MB · Views: 33
Nitrogen the leaves go yellow at bottom first.
My guess is mgso4, but why is hard to say without grow variables.
Looked it up, mgso4 is magnesium? You think it’s deficient or toxicity because I started giving cal/mag when I started the bloom nutes until I realized my tap already (should) have plenty so stopped the cal/mag last two feedings (about a week ago).
 
Looked it up, mgso4 is magnesium? You think it’s deficient or toxicity because I started giving cal/mag when I started the bloom nutes until I realized my tap already (should) have plenty so stopped the cal/mag last two feedings (about a week ago).
It would be deficient, but is it because of not enough, or is it an antagonist of other nutrients, or wrong ph? It's hard to say without all grow variables.
 
tell us your grow details.
soil
temps
relative humidity
what type of water
how offten and how much food is given
soil or hydro
PH
any and all details about your grow
it helps people get an idea as to whats happening/going wrong
i used to give nitrogen with flowering nutes, because plants need it, ppl for get that, not all through flowering, but at the beginning
 
tell us your grow details.
soil
temps
relative humidity
what type of water
how offten and how much food is given
soil or hydro
PH
any and all details about your grow
it helps people get an idea as to whats happening/going wrong
i used to give nitrogen with flowering nutes, because plants need it, ppl for get that, not all through flowering, but at the beginning
What he said
 
tell us your grow details.
soil
temps
relative humidity
what type of water
how offten and how much food is given
soil or hydro
PH
any and all details about your grow
it helps people get an idea as to whats happening/going wrong
i used to give nitrogen with flowering nutes, because plants need it, ppl for get that, not all through flowering, but at the beginning
Soil is FFOF/Perlite 50/50. Temps are between 70-80. Humidity has been high around 70 rh but I have good dehumidifier on the way to take care of that. Water is tap ran through a carbon filter, ph’d to about 6.0 after nutes are mixed. Didnt feed anything up until about week 5 (late I know). Went with GH trio minus the grow. Maybe I should have picked it up? Idk I’ve heard of autos needing more nitrogen during flower… been watering every 3-4 days. Gave 2ml/per gallon of micro and bloom last two feedings worked up from 1ml/gallon at 5 weeks, we are now coming up on week 7. Gave 1ml/gallon of calmag first two feeding as said before but didnt last two feedings. Any help would be greatly appreciated!
 
Last edited:
I think its generally need nutrients NPK less nitrogen
Think that helped my similar leaves because only the biggest plant got hit
Or iron, micro nutrients
I could be wrong though
Someone is probably more experienced.
 
Last edited:
Thanks. How do I figure out of what the imbalances are?
I put this into ChatGPT - "What resources are available to learn how to identify and resolve nutrient imbalances when growing cannabis in soil?"

It returned a page listing some resources.

Until you develop knowledge and then expertise, the best way is to start a grow journal, post information about your grow, include pictures of the grow environment, the plants, and closeups of the impacted leaves.

There are a lot of growers who are willing to share their expertise and, between them, you should end up getting back on track as well as picking up some knowledge.

The other side of the coin is to read up on "how to grow cannabis" and follow the best practices. That will tend to "Eliminate that 'awe shits' and cut down on the 'oopsies'."
 
Soil is FFOF/Perlite 50/50. Temps are between 70-80. Humidity has been high around 70 rh but I have good dehumidifier on the way to take care of that. Water is tap ran through a carbon filter, ph’d to about 6.0 after nutes are mixed. Didnt feed anything up until about week 5 (late I know). Went with GH trio minus the grow. Maybe I should have picked it up? Idk I’ve heard of autos needing more nitrogen during flower… been watering every 3-4 days. Gave 2ml/per gallon of micro and bloom last two feedings worked up from 1ml/gallon at 5 weeks, we are now coming up on week 7. Gave 1ml/gallon of calmag first two feeding as said before but didnt last two feedings. Any help would be greatly appreciated!
I was under the impression it's a 3 part nutrients and you use all 3 parts through veg and flower.
So you'd need the grow.
Unless your using a different GH trio?

Have you looked at the feed charts?
 
Soil is FFOF/Perlite 50/50. Temps are between 70-80. Humidity has been high around 70 rh but I have good dehumidifier on the way to take care of that. Water is tap ran through a carbon filter, ph’d to about 6.0 after nutes are mixed. Didnt feed anything up until about week 5 (late I know). Went with GH trio minus the grow. Maybe I should have picked it up? Idk I’ve heard of autos needing more nitrogen during flower… been watering every 3-4 days. Gave 2ml/per gallon of micro and bloom last two feedings worked up from 1ml/gallon at 5 weeks, we are now coming up on week 7. Gave 1ml/gallon of calmag first two feeding as said before but didnt last two feedings. Any help would be greatly appreciated!
Gh trio is better suited to hydro. Not saying you can't use it, it's just not ideal.
 
Back
Top