Heat/Light Stress

bryleetch said:

oh I see what you're saying and I'm thinking you're right. I read somewhere grinded up eggshells can be used in place of lime so you think if I do that it'll balance everything?

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Compost is an amendment, it does not really make for a good base medium...too heavy. Peat on the other hand is good, for blueberries. The ph is so acidic you must add a base for cannabis.

Ever heard of Promix?. All they do is add lime, perlite, and some nutes to peat moss and sell it as a full growing medium.

You can easily make your own Promix, then doctor up a bit with compost. The proper ratio of dolomite lime is 1/2 cup per gallon of peat.

However, if you can get a hold of a bale of Promix at Home Depot, I would strongly advise using it as opposed to blending your own at this point.

It's the perfect medium for beginners.

Sunbiz1 said:

Eating itself?.

And here I was thinking there was nothing new under the sun.

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While it may be new to you what I am saying is not new at all. It is basic, fundamental principle with almost all plants. Some nutrients are mobile others are not. When there's no nutes to be had in the water/soil the plant will take the mobile nutrients that it has in lower leaves and use them for new growth, which will cause those brown spots. So yes... essentially the plant will eat itself. You should do a little research instead of hating...

Sunbiz1 said:

I see some yellowing in one photo near a leaf tip, which is an indication of too much N.

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Are you sure? I know yellowing to be a sign of N possibly lacking, or other nutrients. Yellowing is a sign of depleteion. Deep, dark green fan leaves is a sign of too much N, usually.

Gquebed said:

While it may be new to you what I am saying is not new at all. It is basic, fundamental principle with almost all plants. Some nutrients are mobile others are not. When there's no nutes to be had in the water/soil the plant will take the mobile nutrients that it has in lower leaves and use them for new growth, which will cause those brown spots. So yes... essentially the plant will eat itself. You should do a little research instead of hating...

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I already researched you, just to make sure I wasn't wrong...and I'm not.

I also have dozens of successful grows uploaded on this site.

The OP needs to change his/her medium, not add nutes. And you should have suggested he or she add perlite, since you use a ton in your grows.

Gquebed said:

Are you sure? I know yellowing to be a sign of N possibly lacking, or other nutrients. Yellowing is a sign of depleteion. Deep, dark green fan leaves is a sign of too much N, usually.

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Yellowing on leaf tips can also be the first sign of overfeeding, as opposed to all the yellowing leaves in outdoor cannabis plants during Fall.

Sorry, not trying to make this a debate...just want OP on right track.

It looks like the soil might be a little "hot". Flush a couple of times and it should be fine. The plant looks okay for the most part, so it's probably not a big deal. If the dead spot keeps growing, all you can do is keep flushing and/or transplant into some commercial potting soil. I've had this happen before shortly after transplanting, but it tends to balance out pretty quickly unless the soil is way out of whack.

Thanks for all the info and help guys im gonna adjust a few things like the soil, water, and temp and if that doesn't do the trick i'll transplant into some of that promix. I don't think the plants are doing that bad yet where I need to transplant tho. Btw to help settle this little disagreement I did just give them a very tiny amount of nutes just to see what will happen. Really just experimenting and trying to learn with this grow

Some of you were right the problem is overfeeding. More spots popped up after using nutes yesterday so clearly its getting to much. Some leaves are a paler green around its edges too which I think is ammonia toxicity. I keep getting an error uploading pictures but once I can I will.