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Thread: My plants have spots

  1. #1
    Join Date
    Oct 2010

    Default My plants have spots

    Can anyone tell me what is wrong with my plants?
    This is my Artemisia absinthium
    These spots seems to be black/grayish and also yellow

    and this is cherry tomato plant
    The leaf is curling in to itself and has a white spot on one leaf.
    It also seems to me that the pland is kind of pale green to yellowish.

    I have 150W red cfl light and Ebb & flow system
    Water tray is holding 24 L of water and the upper tray is 19 L

    Since I'm using nutrition from my country I don't know how
    much of it I should use. Can anyone calculate how much of
    this nutrition I should have?

    Here is the ingredients in 500 ml:
    Nitrogen (N) 0.27%
    Phosphate (P2O5) 2.0%
    Potash (K2O) 3.0%
    Sulphate (S3O) 6.1%
    Chloride (Cl) 6.7%
    Silica (SiO2) 0.2%
    Iodine (I) 0.9%
    Bromine (Br) 0.8%
    Soda (Na2O) 18.9%
    Magnesia (MgO) 0.58%
    Lime (CaO) 0.44%
    Alumina (Al2O3) 0.23%
    Copper 40 ppm
    Cobalt 4 ppm
    Nickel 24 ppm
    Zink 100 ppm
    Molybdenum 10 ppm
    Manganese 40 ppm
    Boron 1 ppm

  2. #2
    Join Date
    Oct 2010


    Is this the only fertilizer u using? If so, where is the calcium? Also u need more N and thats a hell of a lot of Molybdenum.
    Tomato plants need lots of Ca. I always match N to Ca when growing tomatoes. If I was u I would get some Cal-Mg and add it to ur nutes.
    Hope this helps
    Last edited by MJACTIVIST; 10-29-2010 at 04:09 PM.

  3. #3
    Join Date
    May 2011

    Thumbs up

    Nitrogen problems are a common occurrence in hydroponics gardens. When you see yellowing leaves (most often the larger and older leaves first), with the yellow starting at the tip and gradually causing the entire leaf to go yellow, youve most likely got a nitrogen shortage. For sure, the language of plants is tricky, and you have to pay careful attention to accurately determine what theyre saying. For example, if you see yellowing of only the youngest leaves (new growth), thats not a nitrogen problem- its a sulfur problem, even though yellowing is the primary symptom.

    And are those ingredient details put up on the nutrient label? because if you are staying in the states it could get bit tricky. sometimes we encounter different problems with plants and we dont get to figure out the exact reason but for the most number of times, its the nutrient ingredients. All hydroponic companies dont give out complete details about their nutrients ingredients. their labels are manipulated and it because of the state laws regulation. there is an interesting story here non reuters google "advanced-nutrients-hydroponics-experts-reveal-government-regulation-of-hydroponics-industry"

  4. #4
    pates32 Guest


    Some insects cause small, yellow spots on leaves.Over watering also leads to mold and mildew development, which causes yellow spots on the plant and leaves.Also a lack of sunlight causes yellowing.Get more info on plant care.

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