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My leaves are turning a golden rust color

Discussion in 'Marijuana Plant Problems' started by swishatwista, Nov 16, 2008.


    swishatwista Well-Known Member

    Like i said, my plant leaves are turning a golden rust color, and its spreading. At first i was thinking it was caused by heat or the light too close, but im starting to think it could be a bug or some deficiency. My leaves are starting to curl upwards also, but only slightly and its only mainly on the leaves that have a discoloration, what do you guys think?
    I'm takin pictures in about 20 mins

    swishatwista Well-Known Member

    some pics of the damage

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    ripz New Member

    looks like nute burn

    smokeybandit22 Well-Known Member

    again I would have to disagree with Ripz. without more info, I would have to guess that your soil is very acidic and locking out something like Calcium.

    ripz New Member

    ha seems like you enjoy disagreeing with me, either way the answer is flush with low strrength nute solution then start back on 1/4 strength nutes

    illusionz1 Well-Known Member

    Lookin like a ph issue to me...

    smokeybandit22 Well-Known Member

    nat at all ripz, but I do agree with you about the remedy. the last arguement we had was over you stating a ca deficiency. you dont think so here? I mean with that bark and such looks like the soil can be very acidic. what about adding some lime to the equation to help buffer that ph and add some extra mg and ca?

    found this to back me up fishsticka:

    Calcium (Ca) -Macro Nutrient and an Immobile element.

    Calcium is another important element that helps the plants cell walls, cell division in making the plants stems, stalks, branches stronger, as well as contributing to root growth, mostly the newer root hairs, Calcium also helps enhancing the uptake of K in the the plants roots. Calcium moves really slow within the plant and tends to concentrate in roots and older growth.

    When plants exhibit a Calcium deficiency the younger leaves are the first to show it as well as older leaves. The Leaf tips will die back, the tips may curl, and growth of the plant is stunted. The plant can show a weakness in the stems and branches, as well as a under developed root system that can lead to bacteria problems with roots dieing off. Having slow plant transpiration rates can aggravate the uptake of calcium. Make sure your soil isn’t very acidic, for calcium gets harder to be absorbed through acidic soils, Which leads to having a plant that is deficient in Calcium. The leaf tips, edges and new growth will or may turn a yellow/brown color that happen in spots and often surrounded by a sharp brown outlined edge and then the leaf tips die back. If too much calcium is given at an early stage of growth it can stunt the growth of your plants. Having to much of calcium will also flocculate when a concentrated form is combined with potassium. The parts affected by a calcium deficiency are the roots. Stem or petiole, young or old leaves.

    Too much Calcium will lead to other micronutrient deficiencies. Calcium fixation is caused by many types of mediums such as: clay soils, unbuffered coco and humus. The lime tends to bond to these soils very easily. The stems of the plant will not be able to hold the plant up and will exhibit a white brown in between the veins of the leaves when having too much calcium. Also having to much potassium and or nitrogen will cause a calcium lockout.

    Problems with Calcium being locked out by PH troubles

    Very acidic soils with excessive potassium, dry and or wet soil. Lack of calcium in the soil may cause too acidic soil. This may cause to Mg or Iron deficiency or very slow stunted growth


    Calcium gets locked out of soil growing at ph levels of 2.0- 6.4
    Calcium is absorbed best in soil at a ph level of 6.5-9.1 (Wouldn’t recommend having a ph of over 7.0 in soil) anything out of the ranges listed will contribute to a
    Calcium Deficiency.

    Hydro and Soil less Mediums

    Calcium gets locked out of Hydro and Soil less Mediums at ph levels of 2.0- 5.3
    Calcium is absorbed best in Hydro and Soil less Mediums at ph levels of 5.4-5.8 (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Calcium Deficiency.

    Solution to fixing a Calcium deficiency
    To fix a calcium deficiency you can treat by foliar feeding with one teaspoon of dolomite lime or Garden lime per quart of water, Or Any Chemical/Organic nutrients that have Calcium in them will fix a Calcium deficiency. (Only mixing at ½ strength when using chemical nutrients or it will cause nutrient burn!)
    Or you can take crushed up dolomite lime or garden lime in a gallon of water and water it in the soil. 1 to 2 teaspoons per gallon of water, which will be slow acting. Garden Gypsum, which is medium absorption. Limestone, which is medium absorption, Rock Phosphate and Animal wastes which are both medium/slow absorption

    ripz New Member

    sounds good to me with the curled up leaves its gettin lockout so flush flush flush

    toxiclotus Active Member

    wow. thank u smokeybandit22... gr8 post. u may have just saved my babies 2.

    smokeybandit22 Well-Known Member

    I hope I helped. just gotta watch that ph. some fine dolomite lime will do wonders to buffer your ph and give some needed calcium and magnesium.

    swishatwista Well-Known Member

    Thats kind of weird, iv only fed nutes once and it was at a low dose. This problem didnt start until about 6 days after the feeding, does that sound correct? I mean could i just water again and then wait a week and then add some low strength nutes as well as some cal mag, or should i add the cal mag sooner?

    swishatwista Well-Known Member

    Nevermind i read the post a second time when i had more time and i think i got the problem squared away, thanks alot guys

    blackshark50 Member

    Can someone please help I think I have a serious problem. There are spots on the leaves kind of brown and now they are white at the edges. the upper small leaves are also changing colour at the tips and curling upwards. The lower leaves are curling downwards and dying I think so I removed it can you tell me what's happening and what should I do?????

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    joshbigbuds Well-Known Member

    i have the same problem but im not using nutes so i would disagre eon all of youse

    Bongmilker Member

    Great info im having the same problem im gona flush tonight then add nutes with calcium at a low rate tmr.

    doctorwizzy Active Member

    dude those pics suck balls

    DoseThemAll Member

    You are over feeding homie. There are signs of Nitrogen Toxicity, dark dark green leaves and the curls. I bet they are a bit stunted too huh? Too little gets better results then too much IMO.
    Flush for 2-3 feedings, maybe even longer if they haven't gotten a tad bit lighter. What are you feeding them?


    DoseThemAll Member

    You are overwatering. They need to dry out so the roots will grow in search of food, which over time increases root mass= water uptake= +++yield.

    twostrokenut Well-Known Member

    Youse check ur pH much? Youse miss that post about the dolomitic lime?

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