hi guys got some trainwreck from greenhouse they have been flowering for 3 weeks and now the plants have about 30% of the leaves yellowing can anyone help dont want fucked up bud

If they are yellowing from the bottom up give them a 1/2 dose of veg nutes. It's hard to tell w/ out pics..

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My 1000 watt Legal Multistrain Growbox - Flowering

LowRyder 2 150watt HPS and CFL Growbox

Like it was said without something to look at it can be hard to tell and with a description of events that is not ultra clear it makes it more of a guess but right now I tend to believe it is most likely time to feed or increase the normal feeding, if the yellowing began at or near the bottom and then spread from there.
　
The less likely possibility, though it can happen, is if someone has way to little lighting even shorter younger healthy plants will get yellow leaves on or near the bottom due to lack of light.
　
But my best guess is the first.

But if the yellowing began on the middle leaves and then spread I'd likely go with the following.

Mb - MOLYBDENUM (Mb)

Yellowing of middle leaves. Foliar feed with chemical fertilizer containing Mb.

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Do you know what "nemesis" means? A righteous infliction of retribution manifested by an appropriate agent. Personified in this case by an 'orrible cunt... me.

if the yellowing started at the top, it could be a nitrogen deficiency.

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thanks guys will get a pic up asap

sorry guys couldnt get a picture up today had a look at the plants and some leaves are bright yellow but are still strong dont know if this helps

Chad851.... Yellow leaves can mean a lack of Nitrogen and/or Sulphur. Check soil pH first, before assuming this. If the soil pH, is below 6 or above 7.2, nutes are being locked out. Always correct soil pH issues first.
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Overwatering can also cause Yellowing of leaves. Soil should go through moist and dry spells. Not constantly moist, or even worst, wet all the time.
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If soil pH is fine and your soil is not over moist, then feed them some of your grow fert, with a teaspoon of Epsom Salt mixed into a gallon of water. The Epsom Salt will provide both mag & sulphur, in a mellow way.
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Hope this helps.....
Keep it Real....Organic....

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sage words as always!


cheers
-g

hi guys i checked my ph and its 8 i have to expensive ph meters but when i put it into a bottle of mineral water i dont get the same result as it says on the bottle also i have ph down but dont know how to use it

well i would get fresh water, add ph down to take it to 5 or so on the scale then add it to your very alkaline water. the 2 will mix and youll end up around 6.5 then do it again tomorrow. and the day after that and the day after that until the pH is back to the nice 5.8-6 range. i think changing it too quickly could hurt the plant. but leaving it at 8 is certain death. and we need pics of those plants. if they are flowing then some yellowing is normal

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