Light Bleach, need Nitrogen, or ?? 1st time with this symptom.

Howdy folks,

This plant is a wonder woman clone, been in a 3 gal grow bag since 4/7.. roughly 5 weeks. Fox farms ocean forest and perlite mix. I gave her her first feeding of grow big and big bloom about 3 days ago just after i noticed this problem. I may have waited a bit too long to feed, but I was tryin to not make the same mistakes and burn my plants this go hehe.

I have a 400 w hps temps are high 70s to low 80s like 76-82 tops. I watch them closely. I monitor temp above the plants with a probe hanging from my reflector.

Ph is 6.5 in, 6.5 runoff.

I also have read that fox farms can be lacking in cal/mag. Since this is my first time seeing this issue, im asking for some advice Also resembles nitrogen def I think?

I really am not sure

I foilar fed yesterday and the day before with a light mix of grow big and big bloom, no noticible diff.. doesnt seem to be gettin worse or better atm.. I backed it further away from the light also.

Thanks for reading my long winded post hehe.. I'd really like to know what this was caused by, so I can avoid the problem in the future. There are other plants that were approx the same distance from the light and roughly the same age.. but diff strains. No signs of this problem yet with them.

Nitrogen deficiency manifests itself in the lower fanleaves first..Kinda looks like its beginning on the new growth on your plant. I would start there... (sorry all i can offer right now)

I agree, seems to be on the newer growth for sure. I dont have any cal/mag.. but I do have some grow big hydro.. it has both calcium and mag. Im guessing with the length of time I went without feeding its a deficency.. but the closest pix I could find to match were of light bleaching.. heh just when I thought I was getting good.

Definately not light bleaching. I havent experienced a cal mag def before

check out this guide it helped me a lot. I picked out magnesium for you. the rest is here: http://www.icmag.com
/ic/showthread.php?t=11688

Check out sulfur deficiency too

Magnesium (Mg) - Micronutrient and Mobile Element


Magnesium helps supports healthy veins while keeping a healthy leaf production and its structure. Magnesium is significant for chlorophyll-production and enzyme break downs. Magnesium which must be present in relatively large quantities for the plant to survive, but yet not to much to where it will cause the plant to show a toxicity.


Magnesium is one of the easiest deficiencies to tell… the green veins along with the yellowness of the entire surrounding leave is a dead giveaway, but sometimes that’s not always the case here. In case you have one of those where it doesn’t show the green veins, sometimes leaf tips and edges may discolor and curl upward. The growing tips can turn lime green when the deficiency progresses to the top of the plant. The edges will feel like dry and crispy and usually affects the lower leaves in younger plants, then will affect the middle to upper half when it gets older, but It can also happen on older leaves as well. The deficiency will start at the tip then will take over the entire outer left and right sides of the leaves. The inner part will be yellow and or brownish in color, followed by leaves falling without withering. The tips can also twist and turn as well as curving upwards as if you curl your tongues.


Excessive levels of magnesium in your plants will exhibit a buildup of toxic salts that will kill the leaves and lock out other nutrients like Calcium (Ca). Mg can get locked out by having too much Calcium, Chlorine or ammonium in your soil/water.
One of the worst problems a person can have is a magnesium def caused by a ph lockout. By giving it more magnesium to cure the problem when you are thinking you are doing good, but actually you are doing more harm then good. When the plants can’t take in a nutrient because of the ph being off for that element, the plant will not absorb it but it will be in the soil… therefore causing a buildup. A buildup will be noticed by the outer parts of the plant becoming whitish and or a yellowish color. The tips and part way in on the inner leaves will die and feel like glass. Parts affected by Magnesium deficiency are: space between the veins (Interveinal) of older leaves; may begin around interior perimeter of leaf.

I would Flush. It will bring you back, and release all your lockouts( i use General hydro flora kleen). then next water start your feeding program

View attachment 945192dude my plant was looking exactly like yours, gave it some nutes and it was fine, im pretty sure its ZINC deficiency because it starts at the tops and i dont know of any other deficiency that does that. heres a pic of what ZINC deficiency looks like

Thanks guys. Good info. I dont think a flush would be in order tho, because its only had one feeding of nutes in that soil. Since I dont have any cal mag.. I decided to foilar feed again today with grow big and big bloom, and then I gave her some grow big hydro after I phed it up to 6.5. It has more stuff like cal/mag than the regular grow big. Im goin to go down and check the zinc ratings on them both also. Thank you again.