Plant Moisture Stress - Symptoms and Solutions

My plants are about 7 inches tall. I only had my first set of true leaves on 1 plant turn yellow and started curling down........ I fixed the water I was using with RO water, and the next few sets were fine. Today I looked and on 1 plant there are holes on 1 leaf..... Look like tears, no coloration or anything??? This due to lack of calcium??

Back ground:New to growing.....

Doing a Hydroponic L.E.D. grow
My Hydro table is 4 feet long by 2 1/2 feet wide. about 10 inches deep.....
I use 6 gallons of Reverse Osmosis Water from Wal-Mart
PPM when I get it is almost 0. After I add Nutes, and buffers it brings it to about 220
rises slowly for a few days

have 4 plants, about 6-7 inches tall
age of the plants 1 month 2 weeks

To Flower I will a High Pressure Sodium light @ 400watts with flowering bulb.....
All top of the line nutrients
Floraduo for my pH Up and Down
Nutrients are A&B from Flora
and then a GROW root formula from them as well

Blue labs pH pen, and PPM meter, expensive but well worth it.
have 4 plants, Hybrids, big leaves so leaning more towards sativa's.


Very beautiful, first set of true leaves on 1 plant came out a little yellow and curling up, now the same plant which has about 6 leaves 1 leave has tiny holes in it and is yellowing.

Needs some quick advice and/or opinions on what may be going on with my ww x bb, she's about 6-7 weeks in veg and very bushy, but just the last 2 days all the leaves (mainly canopy) have begun to droop ridiculously. Please excuse the lighting but ill add another pic so you can see they're still healthy green View attachment 2967749View attachment 2967750... Thanks in advance for any replies or suggestions, b.

Hi, I just wanna know what's going on with my plant
I use Advanced nutrients grow/micro/bloom (ph perfect) 2ml/L per week
A friend told me that is over-fertilised and the ph of the soil is under 5.8
Plants are 43 days old
Should I buy a ph-up or something?

dr bs those are looking over watered to me, dig your finger in there and smell it, you prolly have root rot. that pale green look is looking like it's having a hard time getting N, either due to overwatering or you're pushing bloom foods too much

costicla, ph up and down is useless when you overwater, be sure you aren't over watering before you try to correct with ph up and down.

you guys would probably be suprised at how much water your plant doesn't need. I'm not saying don't water them, i'm saying be more careful and stick your finger in there
know what medium you use, practice with it, and you will become familiar with it. If it's a bagged medium, check out what they put into it, and readup on what each does.

body building farmer, pictures are good, and will help with the diagnosis

seems like these are all in the right thread though, if you know it's moisture stress; why are you guys asking what the problem is??

I don't think I overwater, I always put my finger on the soil (like 3-4cm) and when is dry...
Anyway, thanks for the answer, I will come with an update in 3,4 days

Can you help w these?

https://www.rollitup.org/marijuana-plant-problems/784493-help-please-mold.html
More info about my last reply thank you very much!!!

if soil is dry i would flush with distilled water use 1 gallon for that plant. see if it rebounds remove all dead leaves. MFM looks like heat or chemical burns. what did you do too it last and what is your air temp where its grown at?

cost you dont ahve to balance soil flush with distilled water to get all the junk out and that should also bring your soil closer to the right ph till you get a tester.

DCobeen said:

if soil is dry i would flush with distilled water use 1 gallon for that plant. see if it rebounds remove all dead leaves. MFM looks like heat or chemical burns. what did you do too it last and what is your air temp where its grown at?

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air temp is always between 70-80 and I don't use chemicals just organicide and neem it def smells like a fungus and spreads about the leaves

All when in doubt leaves are turning fast and your air temp is good think what did you do last feed nutrients? if so flush it with distilled water. you should be flushing it every 3 weeks at max (2weeks is better) anyway to remove any buildup in the soil. I use air injection soil method and i change the water every 2 days so the junk it doesn't want doesn't sit around but that is diff than what you all are doing. Plain soil grow is harder. if you add 1/2 cup water to your plant it should evenly go down into the soil evenly not stand there or start coming out the bottom when the plant is light and soil is dryish. and you have to make sure the whole plant gets water so when you water a dry plant let 1 cup come out the bottom on a 1 gall pot. and dont feed nutrients every day unless you 1/7 the strength and if you do daily feedings flush 1 day a week.

MoonFuckingMan said:

it def smells like a fungus and spreads about the leaves

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What does fungus smell like?

Just wondering.

AimAim said:

What does fungus smell like?

Just wondering.

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schnozberries... duh

DCobeen said:

All when in doubt leaves are turning fast and your air temp is good think what did you do last feed nutrients? if so flush it with distilled water. you should be flushing it every 3 weeks at max (2weeks is better) anyway to remove any buildup in the soil. I use air injection soil method and i change the water every 2 days so the junk it doesn't want doesn't sit around but that is diff than what you all are doing. Plain soil grow is harder. if you add 1/2 cup water to your plant it should evenly go down into the soil evenly not stand there or start coming out the bottom when the plant is light and soil is dryish. and you have to make sure the whole plant gets water so when you water a dry plant let 1 cup come out the bottom on a 1 gall pot. and dont feed nutrients every day unless you 1/7 the strength and if you do daily feedings flush 1 day a week.

Click to expand...

I just put it in supersoil last week and only water with distilled water

MFM what is your humidity? do you have good air exchange and a fan? I have not dealt with mold. I am to anal to let that happen.

the humidity is between 1-20% I live in Arizona no humidity to speak of and ive never had mold either I keep my setup clean and well ventilated.

please see
https://www.rollitup.org/marijuana-plant-problems/784493-help-please-mold.html

mfm that doesnt look like powder or even black mold you can get a tester but i would flush the heck out of that plant it looks like chemical burns big time to me.

like I said 0 chemicals and I know it doesn't look like mold but def smells like it

thanks a ton for your answers I appreciate it