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New growth yellowing

Discussion in 'Sick Plants and Problems' started by 967, Sep 4, 2011.

  1. #1 967, Sep 4, 2011
    I have 3 plants under a 250w hps (1x white widow, 1x skunk #1 and 1x random bagseed) all were doing fine up until a few days ago now the new growth coming through especially on the white widow is pretty much yellow. It's the same with the other 2 plants but nowhere near as bad. White widow is also stretching a lot more than the other 2 (both skunk #1 and white widow are feminized)

    I have them in 10 litre buckets in regular potting mix, they're a little over a month old. Given them one feed of super grow at 30% strength and a few mists of water with a drop of superthrive as they were quite dry. (Heat and ventilation aren't an issue just underwatered) Other than that nothing else i can think of

    Whats likely to be the problem?
     
  2. #2 DJEJ, Sep 4, 2011
    Without pics, I would say lack of nitrogen...
     
  3. #3 967, Sep 4, 2011
    Ype thats what you'd assume but it looks unlike any nitrogen deficient plant pics i've seen online. its more the veins going yellow while the leaf is still green and the older leaves are green aswel its pretty much only concentrated on the last few days growth

    And to show signs of it not long after first feeding seems a little strange..
     
  4. #4 GrowBot, Sep 4, 2011

    month old plants having being fed one time is a problem. they should be getting fed full strength nutes once a week at this point. "they're hungry, feed them!" you don't mention anything about ph.... in soil, optimal ph is 6.5....
     
  5. #5 967, Sep 4, 2011
    Last time i tested the run off it was 6.3 though im not sure if i should be trusting it or not (cheap crappy tester)
    That was with no food, could my nutes have thrown the ph out?

    The reason i hadn't fed them was i had nothing to feed them, thought the potting mix would take care of the first month..
     
  6. #6 WELLHELP, Sep 4, 2011
    Nitrogen craving or maybe heat stress if coming from edges inward. Nitrogen is opposite.
     
  7. #7 GrowBot, Sep 9, 2011

    as i mentioned, your plants are hungry. i start at 1/4 strength at around 2 weeks. don't concern yourself with the ph run-off. the ph of the medium (soil) will constantly be changing. as the plants feed/drink, the numbers will change. as long as you properly ph "everything," you put in/on your plants, ph should never be an issue. for instance, let's say your plants look beautiful, but the run-off ph is out of the 6.5 range. are you gonna want to try and get the medium ph to 6.5? heck no!! unless the plants begin to display some sort of issue, why mess with it??? you should never chase ph. respond only when the plants ask you to. FEED THEM, LOL!!!
     

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