Is there a Doctor in the House?

I have learned so much in my time here, so much more to learn.

This plant is being grown indoors, one of two clones of the plants that I am currently flowering. I received these as clones from a friend, some sort of Blueberry strain. This is my first attempt at growing in over 30 years, yeah I'm of advanced age, hahaha.

Plant is just short of 8 weeks since being cloned. It is was FIM'ed and is being LST'ed until I can transplant and move to flowering chamber.

Watering in 1/2 gallon of water, each plant gets 1/4 gallon per watering, there are two plants, side by side, one has this problem, the other not. Water every 5 or so days, deciding by feeling the weight of the pot to see if they need a drink.

It is the older leaves that are effected, new growth looks fine, but I still want to find out where I screwed up. There is a browning in the leaves that almost looks bronze when you hold it up to natural daylight.

Temp is 75-80 Humidity 50-60%

Growing medium is MG Moisture Control (80%) and Perlite (20%) They were transplanted to this 15 days ago. They are just short of 8 weeks old.

So here are my leaf pics docs, help appreciated by a newbie getting his feet wet. Thanks!!!

Now, ofcourse I am a complete noob....so really I might be (I"m sure I am) just wasting my breath (or my fingers energy if you will) but I think you have what I have.....and I don't know what it is.


My thought about my own issue is calcium def. maybe your issue too?

Did you check the sticky at the top of the "Marijuana Plant Problems" section? There is a nice write up of issues complete with pics. Again yours seems to be like mine, brown on edges and whatnot.

Miracle Grow Moisture Control already contains slow release nutrients. The FF products on top of that is probably causing them to overdose. Just plain water for a month or so. I wouldnt try to flush as that will just make it worse. You will just have to ride it out for a few weeks.......

840/2 said:

My thought about my own issue is calcium def. maybe your issue too? Did you check the sticky at the top of the "Marijuana Plant Problems" section? There is a nice write up of issues complete with pics. Again yours seems to be like mine, brown on edges and whatnot.

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I use CalMag in the same amount as I do with my larger flowering plants and have had no issue. The picture for Calcium def looks more like it starts at the tips or outer leaf, these are starting more in the middle and moving out.

Alexander Supertramp said:

Miracle Grow Moisture Control already contains slow release nutrients. The FF products on top of that is probably causing them to overdose. Just plain water for a month or so. I wouldnt try to flush as that will just make it worse. You will just have to ride it out for a few weeks.......

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I am thinking that you are right, but why one plant of two, both fed the same? Better developed roots on the healthy plant? Confused, but that is nothing new!

Plants can vary greatly from pheno to pheno. Showing stress or not I bet they are both on the verge of nute burn.....
Calcium is a none mobile element so the start of a deficiency usually occurs in newer growth rather than older growth.....

Alexander Supertramp said:

Plants can vary greatly from pheno to pheno. Showing stress or not I bet they are both on the verge of nute burn.....

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Then straight water it is. Thanks Alexander Supertramp, +rep

Your welcome, hope it helps and good luck...I am sure they will pull through, cannabis is a pretty hardy annual......

My first run went so smoothly so far, no hitches. So when this showed up I did freak a tad, but I'm a patient man so didn't do anything drastic. Thanks again.

Alexander Supertramp said:

Plants can vary greatly from pheno to pheno. Showing stress or not I bet they are both on the verge of nute burn.....
Calcium is a none mobile element so the start of a deficiency usually occurs in newer growth rather than older growth.....

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Ahhh good to know! Well then, back to the drawing board for my own issue. In the interm, good luck to you Frosty

P lock-out. check ph.

scroglodyte said:

P lock-out. check ph.

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After looking through pics that was my first guess, but wasnt sure. I will make up a half gal of solution tomorrow and check it again. Was fine first run, but given it is spring runoff time, things may have changed with our water supply, which comes from a reservoir at the base of a mountain.

rainwater is the best, i have found.

scroglodyte said:

rainwater is the best, i have found.

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Exactly the advice of a friend, just don't have a discrete way to gather it. Thanks scrog +rep

FrostyTheBudMan said:

Then straight water it is. Thanks Alexander Supertramp, +rep

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a quick way to find out
when you water the plant collect some of the water that passes through the soil
and check the ph if above 7 then you have salt build up

Alexander Supertramp said:

Reading runoff pH tells almost nothing. And following it will only have you chasing your tail and cause further problems. pH lockout it pretty rare at best growing in soil. pH lockout would mean the mediums pH has fallen below 6 or above 7.5 and in either case the plant would showing more signs. A plant showing a single deficiency is often blamed on some sort of lockout, but in reality its just deficient and needs a better balanced diet. So many *Polly say lockout, Polly says lockout* around because it sounds cool I guess. Fact is lockout and lockup are very rare occurrences in container growing...and salt build lowers a mediums pH, not raise it......

The OPs plants is showing slight signs of burn, not a deficiency anyways......

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OK this is something i read a few times, but always keep my feeds low
so i have never had to do this so you are probable right
thank for telling me.

Looks like Spring runoff from the little snow on the mountain feeding my water supply changed the pH of the water. It was about 5.5 in January, now running closer to 7. The images I have been seeing online would seem to be what those leaves were showing, a P deficiency caused by lockout. Nothing else has changed from the first crop I am growing, soil, containers and feeding schedules all the same, only thing that has changed is the ph of the water. I was lulled into a false sense of security as everything was going so well, I stopped checking the water/nutes ph. My mistake, won't make it again!