cal/mag like spots

so kind of like franjan's thread. i have noticed i get cal/mag like spots on my plants mainly just one. and im pretty sure it is not cal/mag deficiency. what have you guys done to fix this if you have it? raise the lights? add more cal/mag? i need some help. i would hate to have some terrible looking leaves that will spread and kill my plant

I'm in my first grow and it's under LED. I'm not sure what a cal/mag spot looks like but I noticed a small, bright orange spot on one of the leaves. This was on one leaf of one plant out of three and never got any bigger and i haven't noticed any new ones since. This was early on, like week 1 and it's now like week 3. I raised my lights so this could've stopped it, not sure. I'm at about 19" away from top of plants now.

oh alright yeah mine are about 9-10 inches from the light but it isnt the top leaves that get it. the leaves that have gotten i are about 12 inches down. maybe i will have to just lst my plants next time around to get a larger space inbetween since i cant move the lights up much more.

it is possible that i am using to much cal/mag. and i have a mag overload causing a cal lock out. ill have to get some molasses. does anyone know if those two nutrients get absorbed by the soil or does it just run right through it? if it is being saturated by the soil that i would deffinitily understand that lockout.

You need to give basic information about your plants. Age, stage of growth, etc... hard to say much without knowing those basics

How much cal-mag are you using? what size dose does the bottle you have say that is? If you're using a combo supplement then you shouldn't have mg locking out ca.

You need to move your lights up first - 1.5' - 2'. You can always move them back down later.

If your nutrients are well blended into the water then any water absorbed by the soil is going to have those nutrients.

Are you using organic fertilizers? If not the molasses is pretty much useless as far as I know.

Remember anything you change as far as watering stuff in, moving lights, etc can take 2-3 days to actually see the results - not always instant, so be patient.

Oh yeah, check for thrips. Damage looks a little like ca deficiency.

it is a sour candy about 2-3 weeks into flowering and a month old from seed. im in FFOF i feed everyother water. might be to much. i plan on just water for the next couple of waterings. i use 2 ml of cal/mag for about half a gallon of water. the ferts i am using are tigers blood for flower and earth juice catalyst for veg i have general organics biothrive. the cal mag is botnicare and says 5ml per gallon of water. i am half organic. i cant really move the lights... i have a shorter tent and can move them up about 2 inches at the most. my next plants will be very tied down. i will check for thrips. ill also try and get a pic. in pictures the rusty spots and the green leaves blend together and are hard to see.

dank smoker420 said:

it is a sour candy about 2-3 weeks into flowering and a month old from seed. im in FFOF i feed everyother water. might be to much. i plan on just water for the next couple of waterings. i use 2 ml of cal/mag for about half a gallon of water. the ferts i am using are tigers blood for flower and earth juice catalyst for veg i have general organics biothrive. the cal mag is botnicare and says 5ml per gallon of water. i am half organic. i cant really move the lights... i have a shorter tent and can move them up about 2 inches at the most. my next plants will be very tied down. i will check for thrips. ill also try and get a pic. in pictures the rusty spots and the green leaves blend together and are hard to see.

Click to expand...

I used FFOF during my first LED grow and had a similar problem.
It wasn't until during my second LED grow using FFOF that I figured out what the problem was, a potassium deficiency.
Without seeing any pictures it's hard to make a diagnosis, but I would bet that you're experiencing either a potassium, or even a phosphorus deficiency.

interesting ill put up the pics in a min

here are some pics

calcuim deficiency for sure buddy. move lights higher, foliar the calmag @ 2ml/L

Either cal or mag, but a cal/mag supplement should help. I had some sativas show those same spots in veg, epsom salts halted the spread of it. So it was a mag deficiency in my case.

alright i will add cal.mag maybe more than i normally do. why does it only happen on the leaves that are taking in the most light? could it be the led lights causing the cal/mag deficiency?

dank smoker420 said:

here are some pics

View attachment 2281799View attachment 2281800View attachment 2281801

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Thats cal def for sure. What cal mag are you using? Any with edta in are no good. You can mix dolomite lime in th soil. That should do it. But that is slow release. So it will take a week at the least. Greensand in a tea will work almost instantly ( a day) too. It has cal and molybdenum in it. Or even mix in some gypsum rock. Thats is calcium phosphate and sulfate. Slow release too. Im an organic farmer. So I dont use any bottle nutes in soil. Those are all organic cheap remedies. too much mag can cause that too. If you had mag def too the edges would be yellow.

Botanicare makes an organic cal only called calplex and you can use epsom salt for mag. Its 2 parts magnesium sulfate 1 part oxygen.

i am using botanicare cal-mag. should i get new cal mag? this is the only plant that i am having a problem with. i am going to water tonight with just cal-mag

That one is no good. Edta in it is a acetate that acts like a chelating agent. If you use too much it will burn the shit out of your plants. Use what I said or general organics has a good cal mag. I prefer to use cal and mag seperately. Edta is why fox farm is not organic too.

The botanicare calplex (cal) botanicare huvega (mag) both organic and omri listed. But epsom salt is much cheaper than huvega.

If you want to get real jiggy. You can use egg shells for cal. Make sure to peel off inner membrane. Break up in very small pieces. Cook in oven for 20 min at 200 degrees on a cookie sheet or what ever. Grind them up into a powder. Soak in water for 2 days. Then use that water in nute solution or what ever

alright thanks ill get some new cal/mag tomorrow. and ill crush up some dolomite lime and add a little tonight.

I have the exact same thing right now on one of my seedlings... it is the only one out of 20 having the issue. I just removed it from the light and have it on my desk. Gonna give it some water with a small dose of cal-mag tonight and leave it on my desk for a day or two, then put it back farther from the light. My suspicion is that the reason only this one is having the issue is that it is a light sensitive strain -- so will move it out from directly under the light. They're 3.5' under a 240w veg blackstar - growing as fast or faster than under the 400w MH last grow.

If you already have dol lime. Then no need to buy anything else. Dol lime has both cal and mag and buffers ph too. In the future. Mix dolomite lime in soil before planting. But you can top dress and mix it in. If you make a compost tea. When you feed it. The bacteria will break down the dol lime faster so it will be readily available for roots to uptake sooner.

alright sweet that is good to know. instead of buying it tomorrow i will be researching some good teas to use. ive been interested and now it is somewhat nessesary and will help me go all organic.

crab shell meal is another good soil amendment for LED users. I started out with lime in mine last time and added some crab shell in toward the end I do feel it helped. I'm going to be using it in my future soil mixes.