White widow (weird color, stunted growth)

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Bozy

Member
Hey guys take a look at pics of white widow in promix hp.... does this look like a pH problem?? Or what do you think??. I own a shitty cheap pH pen, not sure if it's working correctly, I have been trying to double check with a manual method but once u mix nutrients in it changes color and hard to get an accurate reading.. I have abut 3 that are acting funny and 3 that seem fine ..also they all seem to have very red stems (pic).20180223_184626.jpg 20180223_184636.jpg 20180223_184608.jpg
 
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Blitz35

Well-Known Member
Without truly knowing your ph, it's very hard to say as that's the number one thing (organics aside) that has to be known in order to know fully if you're looking at a deficiency or lockout instead.
With that being said, purple streaks, can be genetics, but that's in less than 10% of the strains. The other cause for purpling stems is lack of phosphorus, though generally it's the petioles that are purple, which you have as well. Lack of sulfur is the other element that would cause stems to have purple streaks and uniquely, yellow veins with green around, which some of your upper leaves show, and a 'woody' stem. To me, the plant seems to not be getting enough nitrogen and possibly potassium as well and magnesium. Can you take a pic of the plant from above looking straight down in natural light? What have you been feeding her? and how much? Source of water?
 
B

Bozy

Member
Blitz35 said:
Without truly knowing your ph, it's very hard to say as that's the number one thing (organics aside) that has to be known in order to know fully if you're looking at a deficiency or lockout instead.
With that being said, purple streaks, can be genetics, but that's in less than 10% of the strains. The other cause for purpling stems is lack of phosphorus, though generally it's the petioles that are purple, which you have as well. Lack of sulfur is the other element that would cause stems to have purple streaks and uniquely, yellow veins with green around, which some of your upper leaves show, and a 'woody' stem. To me, the plant seems to not be getting enough nitrogen and possibly potassium as well and magnesium. Can you take a pic of the plant from above looking straight down in natural light? What have you been feeding her? and how much? Source of water?
Click to expand...
I've been feeding GH trio at pretty low ppm (300) switched to R.O. water a couple weeks ago. Maybe I should strart feeding with higher ppm?? I will post pic soon.. thanks for your help
 
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Bozy

Member
Bozy said:
I've been feeding GH trio at pretty low ppm (300) switched to R.O. water a couple weeks ago. Maybe I should strart feeding with higher ppm?? I will post pic soon.. thanks for your help
Click to expand...
Also I did feed them last night before I heard back on this post......to be honest I came up with phosphorus too...
 
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Blitz35

Well-Known Member
That pic it's a bit easier to see..shows more evidence of P lacking on some leaves. Again, phosphorus and magnesium work hand in hand and used about the same by the plant, so try to keep that at a 1:1 ratio unless an obvious deficiency of one occurs. Some leaves in this light show magnesium starting to be short as well. 300 ppm is a bit low in my opinion at this stage, and if using RO water, you need to add cal-mag.
 
B

Bozy

Member
Yes sir, great advice appreciate it.. like I said before I mixed up a batch of nutrient and put some extra bloom in, and this morning I could already tell they were coming back!!, they are starting to turn the right color green again from the bottom up..
 
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Blitz35

Well-Known Member
Magnesium is the element mostly responsible for the leaves being green, nitrogen contributes as well with some types of chlorophyll, but magnesium is the 'heart' of all chlorophyll molecules. Unless necrotic already, the leaves will turn from yellow back to green once magnesium is added and yes, it happens quite fast, within 3 days it can look like a new plant:) Yours are not bad, so you shouldn't see any ill-effects if corrected and maintained from here on out. Increase in smaller increments the overall feed and see how she responds. Magnesium is a funny deficiency in that the problem can exist for weeks, but the plant won't show any signs of it. By the time you see it on the leaves, it's been an issue for a few weeks already.
 
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