Are these spots fertilizer burn

Could use a little advice, should I give up on her, 6 weeks old runtz auto, trying to get at least a little smoke and deciding if I want to drop 2-3 bills on a light, have spider farms 1,000 led at 18 inches, was told the light would flower one plant, pretty sure it can’t be light burn and it’s only that one leave and the very tips of all leaves

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Looks like you have a potassium and a magnesium deficiencies going on, to me.
I am sure better grower than myself will reply to you. They will probably want to know what your medium or soil type, nutrients, ph, and ppm numbers. If you can obtain these.


COPY/PASTE the below list into your forum post.

Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so; Or post
NA (non applicable)

-What strain, Seed bank, or bag seed (photo or auto)
-Age of plant
-Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
-Vessels: Type and capacity of container (fabric, plastic, etc)
-PH and TDS of Water, Solution, runoff (if Applicable)
-PPM/TDS or EC of nutrient solution if applicable
-Method used to measure PH and TDS
-Indoor or Outdoor if indoor, size of grow space
-Light system List brand and wattage/spectrum
-Actual wattage draw of lights
-Current Light Schedule
-Temps; Day, Night
-Humidity; Day, Night
-Ventilation system; Yes, No, Size
-AC, Humidifier, De-humidifier,
-Co2; Yes, No

If growing Hydro some additional questions:

-DWC? RDWC? Autopots? Ebb and Flow? Other?
-Distance of liquid below net pot (DWC)
-Temperature of reservoir
-TDS of nutrient solution
-Amount of air to solution

Always try to upload a clear picture in white light of any issues you may have to allow the community to assist you.


Magnesium deficiency for sure.

From the pictures available, it’s hard to differentiate between Sulfur or Potassium deficiency, as well.

Since you’re dealing with a magnesium deficiency, and you are not in flowering; I’d say that it is Sulfur deficiency that’s chewing up your leaflets. Dosing with Epson salt solves both issues.


Light green leaves with dark veins plagued and then killed my last grow. I never figured the problem out. The problem is showing up in my seedlings this year. How can I fix this in the seedling stage?

Bruce Banner seeds
Fox farm, Ocean forest soil, tap water,in a solo cup, and no nutrients yet.

@Grasshopper4kungfu, Welcome to the forum! Have you seen this standard deficiency/ excess chart? Magnesium, manganese, or iron deficiency deficiency sounds like your description. Of course ph being out of range can cause a nutrient lockout.
The expert growers here like for you to fill out the support checklist. As this will help them from going down the wrong path.
But here are a couple charts, hope it helps.

I might suggest your watering practice may have something to do with it but without knowing specifics of your grow it’s tough to diagnose. FFOF is a hot medium and some plants have a hard time when started in them. The PH of the media can be an issue with many reports of low PH in FF soils.


Thanks for the tips. I suspect the Ph may be low. Attempting to remedy with baking soda diluted in the watering. I hope that saves my seedlings.