Leaves turning yellow during flowering?

Discussion in 'Marijuana Plant Problems' started by Tom Hutchins, Aug 17, 2011.

  1.  
    Tom Hutchins

    Tom Hutchins Guest

    Ok...I have a strange problem. Let me start out by saying I realize that your leaves will turn yellow and die off durning the end stanges of flowering.....HOWEVER...these turn yellow almost 1 week into flowering. During veg, there is no issue at all.

    This is a green crack strain.

    I grew some indoor and these are outdoor. Both produce the same yellow leaves.

    I know it can't be a nitrogen issue as they were healthy dark green durning veg. They shouldn't be taking in any nitrogen right now anyway. PH is not an issue. Outdoor is strickly organic. Super soil mix. I've added worm castings to surface of soil durning watering once.

    Any help would be awesome! Thanks guys/gals.
     

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  2.  
    Detroitgrower313

    Detroitgrower313 Active Member

    well when you bloom you are usually significantly dropping you Nitrogen levels and that will always cause yellowing, but if they were just fine a week ago, idk what could make em yellow that much that fast?! but if both indoor and outdoor are doing it, i would think they are jus starving for N. j.m.h.o. iam no expert.
     
  3.  
    Tom Hutchins

    Tom Hutchins Guest

    Just seems weird that they would want to have nitrogen still. They need to be focusing on bud growth! Should I get a large dose of phosphorus?
     
  4.  
    Detroitgrower313

    Detroitgrower313 Active Member

    imnot even gunna bs u n tell u sumn i honestly dont kno. i got a post on here for a prob i got. urs jus look like they are def N starverd, but like u said, in flower? and that yellow that fast? that is strange????
     
  5.  
    darkdestruction420

    darkdestruction420 Well-Known Member

    Cannabis actually use a TON of nitrogen during the stretch phase of flowering and even after its a good idea to give a veg feeding every once and a while. Nitrogen being bad during flowering is a myth and its actually very important in keeping your plants main energy producers the fan leaves around and making energy for the buds as long as possible. during stretch phase i give veg nutes about every other flower nute feeding or every 2 flower nute feedings.
     
  6.  
    Hunswayne1

    Hunswayne1 Member

    My plants are doing very similar, from lush green to a bunch of drying browning yellow and still quite a bit of flowering to go HELP
     
  7.  
    thegreensurfer

    thegreensurfer Well-Known Member

    You have a Potassium deficiency. The recent blooming has depleted your soil of Potassium. Assuming your soil ph is within range, add mono-potassium phosphate for the quickest delivery. Was there a recent heavy rain? Or a drought? Both can cause
    K deficiencies for different reasons.
     
  8.  
    Hunswayne1

    Hunswayne1 Member

    It did rain last night, I checked them at 5:30 this evening and was like what the hell!! I have 5 blue knights that are heavily flowering with still lush green leaves, the green cracks have middle finger size buds and the yellow outbreak. Mono potassium phosphate?
     
  9.  
    Hunswayne1

    Hunswayne1 Member

    I feed tiger bloom from fox farm and humbolt county's own sonic bloom which has 51% phosphate and 34% soluble potash derived from mono-potassium phosphate, possibly not giving enough? Giving 1tsp per 5 gallons water X 20 gallons per every other feeding
     
  10.  
    supchaka

    supchaka Well-Known Member

    It could be a strain thing too, I had a chemdog that I ran for a couple years that always yellowed sooner than I wanted it to.
     
  11.  
    thegreensurfer

    thegreensurfer Well-Known Member

    Yea, or the bloom you're using will work. Is what you're giving them the recommended dosage on the bottle? 51/34 is high concentration so I'm guessing you're overwatering or the rain.... Potassium is highly soluble in water so it is leached away easily by excess water.

    It's also possible that drought or high temps are to blame. Rapid transpiration caused by either will cause the leaf to die because it can't replenish the moisture at the rate it is being lost..... mimicking potassium deficiency.
     
    Last edited: Aug 31, 2015
  12.  
    Hunswayne1

    Hunswayne1 Member

    The dosage calls for one teaspoon every 5 gallons I believe I feed 20 gallons with 4 scoops in a 100 gallon Smart Pot with plenty of drainage I feed em that every 5 days
     
  13.  
    Hunswayne1

    Hunswayne1 Member

    Although I did water that morning then it ended up having some kind of freak showers that same night, possibility of over watering sounds logical
     

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