Plant Moisture Stress - Symptoms and Solutions

[Alganj]

I had been watering them every few days until the top part got crusty. Then I would water with H202 also. When I just transplanted the seedling in the yogurt cup, it was drenched and saturated with water and had a hint of funk smell to it. The roots looked stunningly better than I thought. They were whiteish/yellowish tint, but did not look like the onset of root rot, however the smell was musty. Poor drainage I believe.
The soil is MG soil and the PH was 6.3 that I tested and the PPM was 100 when I filtered the dirt through distilled water and measured.

All comments are greatly appreciated. Thanks alot. Please continue helping. Thanks---see before and after pics when I canned the yogurt cup.

 

[Alganj]

Considering the leaves are already drooping on both plants, what do you mean when you say "then no water for as long as it takes to see the leaves droop"?

 

[riddleme]

Considering the leaves are already drooping on both plants, what do you mean when you say "then no water for as long as it takes to see the leaves droop"?

leaves drooping is a sign of overwatering, leaves and stems drooping is a sign of underwatering, plants do not have bones, it is the water that makes them stand erect. They need wet/dry cycles to get O2 and thrive, normally it is bad to allow it to go to the point of "everything" drooping, though it will not kill the plant it does cause stress in your case you have over watered for 5 weeks (also causing stress) best now to allow a good dry cycle then start watering properly once the pots are dry you lift them to get a feel for their dry wieght best way to know when you should water again

You should consider doing a bit more reading what I just typed has been repeated on this forum over 10000 times, it is important to understand what plants need and what makes em thrive, we like to say learn how to read them, they will tell you things if you know and understand what to look for. most common mistake is overwatering, 2nd most common mistake is loving them to death

 

[Alganj]

Thank Man. I have been reading these posts about 8 hour a day for a week now. I guess its just nice to have someone with experience treat my symptoms instead of someone elses.
Noted Noted Noted. Good stuff. Thanks for taking the time to help me out.

 

[crispy93]

My leaves started drooping and then when I got up this morning they were brown and yellow. Over/under watered? Using fox farm ocean forest and no nutes. Just tap water.

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[DaveCoulier]

My leaves started drooping and then when I got up this morning they were brown and yellow. Over/under watered? Using fox farm ocean forest and no nutes. Just tap water.

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I dont know what you have done to them, but I dont believe it has to do with your watering practices. Plants at that stage when placed under moisture stress will become limp, and have yellowing of the lowest leaves, but not to that extent from my own experiences.

Maybe you got a very bad batch of FFOF. It'd be useful to test it with a ph meter, and EC meter if possible.

 

[GeeBee3000]

Hey what's up people? Happy Holidays to everyone. I'm having a problem with Droopy Leaves on my veg plants. I have them in a 5ft.x10ft sealed room with 2 cooled 1000 watt MH Lights. Although I have no hygrometer, I do have the temperature set 68 on my 8,000 BTU Air Conditioner, but I have no idea what the actual room temperature is (If I had to guess I would say 70o degrees F). The plants have been in the Veg Room for about 2 weeks and since I did not soak the Grodan Rockwool Cubes for the recommend 8hrs, I have been watering the plants everyday. I know there could be a list of of possibilities, but what do you guys think? These are some pics of how the plants are currently looking in my Veg Room. Help please!

 

[i81two]

More water and nutes maybe.

 

[DaveCoulier]

Hey what's up people? Happy Holidays to everyone. I'm having a problem with Droopy Leaves on my veg plants. I have them in a 5ft.x10ft sealed room with 2 cooled 1000 watt MH Lights. Although I have no hygrometer, I do have the temperature set 68 on my 8,000 BTU Air Conditioner, but I have no idea what the actual room temperature is (If I had to guess I would say 70o degrees F). The plants have been in the Veg Room for about 2 weeks and since I did not soak the Grodan Rockwool Cubes for the recommend 8hrs, I have been watering the plants everyday. I know there could be a list of of possibilities, but what do you guys think? These are some pics of how the plants are currently looking in my Veg Room. Help please!

View attachment 1346424View attachment 1346423

I would suspect over-watering. They're droopy, and you water every day. Are these your only plants? If so, there is no need for 2k MH. I would also suggest you get a Caliber III Hygrometer. Its one of the best hygrometers out there and costs about $20.

 

[GeeBee3000]

Hey what's up Dave? Thanks for replying to my post. I suspected over watering as well. If so what is the best way to get them to recover? Should I not water them at all until the leaves stop drooping or do I give them less water for until the leaves stop drooping? Anybody's input will be carefully taken into consideration. Thanks again. I should have that Hygrometer tomorrow, I wish someone would of told me sooner.

 

[DaveCoulier]

Hey what's up Dave? Thanks for replying to my post. I suspected over watering as well. If so what is the best way to get them to recover? Should I not water them at all until the leaves stop drooping or do I give them less water for until the leaves stop drooping? Anybody's input will be carefully taken into consideration. Thanks again. I should have that Hygrometer tomorrow, I wish someone would of told me sooner.

Just hold back on the watering until the leaves are rigid again, and then Id probably water the day after, but just use less(maybe half as much as normal). They should perk up within a couple of days if its not too bad. Overwatering seems to be a common problem for rockwool users that I have seen. But learning how to use any medium presents its own complexities.

 

[i81two]

I grow in the 6x6 rockwool cubes and have no problem watering for 15 min 2 times per day from rooted clones and into veg, and up to 3 or 4 times daily well into flower. Take it for what its worth.

 

[i81two]

Why buy a hygrometer when you can pick the plant up and feel if the rw is dry or still holds water ?

 

[wietchepec]

nice avatar i81two...

 

[fat geezy]

Can any body help?
have 3-4 week old northern light, which turn yellow, started with old leaves and going on the newer ones. when they were 2 weeks old I over nutried them with full strength solution of

B.C. Grow 1%-3%-6%
B.C. Boost 3%-0%-2%
thrive alive 1-1-1
Magic call 2-0-0
sugar daddy 0-0-0
next day leaves tips turned brown.
3 days ago I applied same solution but only half strength.
My leaves are turning yellow and tips turn brown. some leaves actually curling up. stems turn a little bit purple.
I don't understand if this time they had to much nutrients or not enough.
I would appreciate any advice

 

[DaveCoulier]

Why buy a hygrometer when you can pick the plant up and feel if the rw is dry or still holds water ?

The hygrometer has nothing to do with his watering practices. He should use it to help maintain a proper VPD(Vapor Pressure Deficit) in his grow room/space.

More can be learned about it here.

 

[DaveCoulier]

Can any body help?
have 3-4 week old northern light, which turn yellow, started with old leaves and going on the newer ones. when they were 2 weeks old I over nutried them with full strength solution of

B.C. Grow 1%-3%-6%
B.C. Boost 3%-0%-2%
thrive alive 1-1-1
Magic call 2-0-0
sugar daddy 0-0-0
next day leaves tips turned brown.
3 days ago I applied same solution but only half strength.
My leaves are turning yellow and tips turn brown. some leaves actually curling up. stems turn a little bit purple.
I don't understand if this time they had to much nutrients or not enough.
I would appreciate any advice

You likely over did it on fertilizers. The best way to know for sure is to buy an E.C. meter, and then test your run-off(shoot for .75-1.5 ms/cm). If you dont have one, I would flush about 1.5 gallons of water through a 1 gallon container. Possibly 2 is required, but it shouldn't require much more. After flushing, they should receive a mild nutrient solution. I would suggest 1/4th whatever your fertilizers suggest, but again buy an E.C. meter. Its worth the investment.

This is the one I use.

 

[i81two]

Thanks for sharing that very interesting article Dave.

That chart says that i should be running a rh of 75% with my 80-85 temps. That seems a little high to me. What do you think ?

 

[DaveCoulier]

Thanks for sharing that very interesting article Dave.

That chart says that i should be running a rh of 75% with my 80-85 temps. That seems a little high to me. What do you think ?

It would definitely cause problems with your carbon filters, as they're efficiency goes down once humidity reaches 65%, and will eventually lead to alot of stink escaping if humidity keeps climbing. Ive had that happen before, and I dont want that to ever occur again. Since we can't run that high of humidity when using carbon filters, you need to lower your temperatures, which will lower the required RH to maintain an optimum VPD.

Here is an online calculator that will help you calculate your VPD.

As for flowering with 75%RH, Ive done it before with nearly pure sativas and indica/sativa hybrids and no mold. RH was usually 55-65% lights on, while 75% lights off. I also maintained proper air flow modeled after Horizontal Air Flow(HAF). Greenhouses use this method of circulating air. I dont have a link off hand for that, but google it and you'll learn plenty.

I generally try to maintain temps of 75F-80F, with humidity around 60-65%. If you can maintain that you'll be in good shape.

 

[GeeBee3000]

The hygrometer has nothing to do with his watering practices. He should use it to help maintain a proper VPD(Vapor Pressure Deficit) in his grow room/space.

More can be learned about it here.

That article contains information I never thought of. It was a good lesson learned, thanks Dave.