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Thread: First time grower having spots on leaves any advice much appreciated

  1. #1

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    Default First time grower having spots on leaves any advice much appreciated

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    Hi all I am a first time grower and everything went smooth until I found some spots on small lower leaves and darkening veins on larger leaves, also yellowing tips. I am on week 6 and just changed to 12/12 lights.Any advice please, I have been fertilizing on cannabis nutrient schedule with hydroponics ( floragro,florabloom,floramagic and calmag) thanks in advance

    Soil or hydro or coco: coco coir, 25% perlite

    Strain:shark attack and critical cure, the first is more affected

    Photo or Autohoto

    plant age:in week 6

    pot size:5 gallon

    has it been repotted? and when?:no

    soil type:

    nutes or additives used and how often for soil:every other feed according to cannabis schedule with hydroponics nutes and calmag,always ph 6.5 and every other feed plain phd water

    Air temps (max min):27/20

    Res temps (max min):not sure what that means?

    humidity:20%

    lighting type and wattage (hps, led, cfl):250 watt hps

    Light schedule:was on 18/6 now on 12/12 as of this weekend

    ph level:6.5

    EC (hydro and coco only) not measuring

    Background EC.

    feed schedule and nutes (for hydro and coco)alternating nutes and plain phd water
    Thanks!

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  3. #2

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    You need to know the EC levels when you run into problems....

    Your PH needs to be reduced to 5.8 and you should feed/water daily - with no plain water days
    "Accuse the other side of that which you are guilty."
    (Joseph Goebbels)

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    Thanks will try that. Any idea what could be the problem?

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    It could be a number of things, but with so much out of whack on the grow, it's had to pin it down to anything specific....

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    It looks like PH to me. If this was my plant i would flush with 5.8 PH plain water until runoff hits 5.8 PH then feed 1/4 strength nutes at 5.8ph. Althought with my nute lineup even 1/4 would be too much at this point. Better to use an EC pen. A good one. Good luck.



    pls excuse autocorrect. i am high of course.

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    How long ago did you flip to 1212? You might want to take it back to veg until you have this resolved. When the plant is sick the buds suffer in quantity and quality.

    pls excuse autocorrect. i am high of course.

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    Thanks for reply. I just watered with 5.8 ph and plenty of runoff and the runoff measured at 7 ph! What does that mean, sorry it's my first grow. I will give much more water then until runoff ph gets lower... I just ordered an EC pen so I can keep an eye on that. I switched to 12/12 last Friday so will I go back to 18/6 for a while?Cheers

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    Ah yes another question what ph should the runoff water measure at ideally?

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    Quote Originally Posted by kkaazz View Post
    Thanks for reply. I just watered with 5.8 ph and plenty of runoff and the runoff measured at 7 ph! What does that mean, sorry it's my first grow. I will give much more water then until runoff ph gets lower... I just ordered an EC pen so I can keep an eye on that. I switched to 12/12 last Friday so will I go back to 18/6 for a while?Cheers
    Keep flushing until you get to 5.8 PH. The high PH implies that you have nutrient lockout imo and you need to stabilize it at 5.8. I would keep it on 18/6 until you see the plant growing and healthy and without any visible issues on the new growth. The damaged leaves will not recover.

    pls excuse autocorrect. i am high of course.

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    The flush may shock the plant and stop all new growth for about a week. This is fine if new growth is healthy. Worth the wait.

    pls excuse autocorrect. i am high of course.

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    General rule of flush is slowly pour 3x the pot size in water. So a 3 gallon pot gets a 9 gallon ph'd flush.

    pls excuse autocorrect. i am high of course.

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    Ok thanks what does imo mean? So I flush with only phd water, no nutrients and after I get the 5.8 ph runoff I do regular nutrients again?

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    Quote Originally Posted by kkaazz View Post
    Ok thanks what does imo mean? So I flush with only phd water, no nutrients and after I get the 5.8 ph runoff I do regular nutrients again?
    Imo = in my opinion.
    When you finish flushing give 1 more pour with 1/8 strength nutes since you dont have ec pen.

    When you have an ec pen first measure your water without nutes and post that reading.

    pls excuse autocorrect. i am high of course.

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    Will do that thanks a lot

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    Also make sure you are giving your plants a proper wet dry cycle, problems on the bottom leafs can also be caused by not leting your plants properly dry out before watering, and as already stated keep an eye on ph of your feed water.


    Check it out, grow started march 11............ Flip May 1st
    Led lighting various soils
    https://www.thctalk.com/cannabis-foru...-dirt-4x4-tent

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    Quote Originally Posted by Wsg View Post
    Also make sure you are giving your plants a proper wet dry cycle, problems on the bottom leafs can also be caused by not leting your plants properly dry out before watering, and as already stated keep an eye on ph of your feed water.


    Check it out, grow started march 11............ Flip May 1st
    Led lighting various soils
    https://www.thctalk.com/cannabis-foru...-dirt-4x4-tent
    He's in coco. You don't want a dry cycle. Water/feed daily

    Next time, no need for perlite either in coco

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    Quote Originally Posted by Bomber View Post
    He's in coco. You don't want a dry cycle. Water/feed daily

    Next time, no need for perlite either in coco
    Oh interesting- do the roots get enough oxygen in 100% coco?

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    Quote Originally Posted by Bomber View Post
    He's in coco. You don't want a dry cycle. Water/feed daily

    Next time, no need for perlite either in coco
    My bad seen the perlite and thought soil.

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