Plant Moisture Stress - Symptoms and Solutions

Medium: Hempy bucket 4/1, Perlite/vermiculite.

PH: meticulously maintained at 6.2 lately.

Watering: when pot feels light.

Nutes: FF trio, less than full dose, plus
Canna boost. PPM 800-1000

Stage of growth: day 20 flower

Temps: 70-82

RH: recently spiked up due to rain......60-70. Was at about 40 before. Problem fixed yesterday.

4 of my 5 plants are thriving, no detectable problems. This plant is having trouble. Leaves are darker green than the others, old growth has the "claw" new growth is curled under. No yellowing, no signs of burn that I can tell, except for splash burn on a few lower leaves.

my leaves are curled under and I have not been able to figure out the problem for along time. If I do not give water the plant wilts but it does not change the leaf cupping. Any ideas? Also can my plants take night temps areound 55? Will it hurt the plant? I am in cold weather climate and the plants are just starting to have these temps. They are well into flower.

goinforbroke said:

my leaves are curled under and I have not been able to figure out the problem for along time. If I do not give water the plant wilts but it does not change the leaf cupping. Any ideas? Also can my plants take night temps areound 55? Will it hurt the plant? I am in cold weather climate and the plants are just starting to have these temps. They are well into flower.

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Temps are relative regarding photosynthesis. If you have a 75/55 during flowering, that's fine. It will slow things down a bit compared to being 10* higher but will not hurt the plant. In fact, Mel Franks has cited studies that lower temps during flowering along with lower RH increases THC production in cannabis. 1982 edition MJ Insiders Growers Edition.

If the leaves are green and healthy, then you're good to go.

When I ran a space heater it seemed to start killing or drying the leaves that were in its radius. I have put a smaller heater now but I think it will just keep the temps at maybe 60 and above. Thanks for the advice.

OK----Looks like it's time once again to put the light on the "eagle-clawing" and what it's caused from.

I have read and seen alot of pics posting the same question------" my leaves are cupping and turning down but I'm not seeing signs of burning"---what is this?????

Nutrient burn shows on the tips of leafs---------99% caused by excess Nitrogen or Iron or both.

Downward Cupped leafs without leaf tip burn--AKA-"EAGLE CLAWING"------99.9% caused by excessive combined ppm load without nitrogen or iron burn. The only exception to this is if the plants are showing as dark bluish-green, then nitrogen is magnifing this condition. Potassium silicate will help with the NITROGEN FIXATION and new growth should resume after a couple of consecutive PPM reduced watering's----hope this helps.

goinforbroke said:

When I ran a space heater it seemed to start killing or drying the leaves that were in its radius. I have put a smaller heater now but I think it will just keep the temps at maybe 60 and above. Thanks for the advice.

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You may have baked them with radiant energy (infra-red) or lowered the RH of the ambient air too much.

I am not doing hydro it is a soil grow. I water every third with nutes. I thought maybe low nitrogen so I added more fish emulsion to nutes about ten days ago. I also think I had a mg deficiency With possible nutrient lockout so I used epsom salts about 1 month ago. I do not overload though I don't think. My ph fluctuates a little between 5.5 and 7. I have well water and it seems a little hard to control. What is potassium fixation mean? Also what is potassium silicate? Am I doing the right things or do I still need the silicate? A little off topic should I ph with the nutes in the water or without?

The rh I think dropped fast after the heat and it is a baseboard heater so it hit about a 3 ft. long section of the room. 1 plant dried out completely in about 2 days.

i was wondering if someone could help i just started growing and durring the night the leves are strait and everything is good and perky but when i set it out side the leaves and brances droop they just hang there the color stays the same but i have started to notice that the lower leaf tips are turning yellow and brown just the very tip help please cause i have no idea what to do

I'm new and hoping you can help. I just started my first set of plants in Colorado. They were doing great until I decided to buy an 'automatic waterer' to try before I go on vacation. What a disaster! The plants all got totally soaked! They are in my basement under a 1000 watt lighting setup. After mopping up the mess I have noticed one plant (see pic) has yellow tips coming out on a set of leaves. The other plants have not manifested this yet. Is this overwatering? Can I leave the plants alone to 'dry out' a bit? I'm handicapped and needed to find a way to curtail the climbing steps, so I'm hoping I can get the automatic watering fixed, but if this is going to mean the demise of my plants maybe I should just give up. Please let me know if this is salvageable.

mustangmaddi said:

I'm new and hoping you can help. I just started my first set of plants in Colorado. They were doing great until I decided to buy an 'automatic waterer' to try before I go on vacation. What a disaster! The plants all got totally soaked! They are in my basement under a 1000 watt lighting setup. After mopping up the mess I have noticed one plant (see pic) has yellow tips coming out on a set of leaves. The other plants have not manifested this yet. Is this overwatering?

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Could be. You'll have to check the condition of the root system for confirmation.

Can I leave the plants alone to 'dry out' a bit? I'm handicapped and needed to find a way to curtail the climbing steps, so I'm hoping I can get the automatic watering fixed, but if this is going to mean the demise of my plants maybe I should just give up. Please let me know if this is salvageable.

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Let them dry out a bit. Water the pot when it feels light to the lift. Can't tell if it's salvageable or not, sorry.

Well most of the plants dried up fine, although I did lose one to mold. I also had to toss one as I used Miracle Gro soil and the gnats just seem to love this stuff. I'm thinking about laying a small amount of diamtomaceous earth on the soil to keep the gnats down. Has anyone tried this? Also, considering my situation with recurrent gnats, I'm wondering if anyone has suggestions of a good quality soil that isn't going to draw gnats too much. Money is not a big factor but I'd like to keep costs down. Also looking for 12" plastic pots to repot. Oh, and I'm starting to think this gnat and dirt thing is a bit of a pain. Has anyone switched recently from dirt to hydro? What do you think about it? Thanks so much everyone!

I had a lot of gnats throughout a 3.5 month grow. They seemed to come with the FF Ocean Forest soil. I tried diatomaceous earth heavily applied to the soil top (used 3 gallon grow bags.) I tried predatory nemotids which may have helped - didn't get rid of em though. Also tried BTI solution applied in a heavy soak. I used sticky traps throughout the grow and a TON of gnats were caught but I never got rid of all of them. A friend who grows commercially says that gnats eat only organics in the soil and not to worry about them. I dunno!!! I did yield a lot of bud from 6 plants under T-5's and CFL's and it did not seem that the gnats hurt anything but they were a PITA. I'd love to know more though so that next grow is better.

hemphopper said:

I had a lot of gnats throughout a 3.5 month grow. They seemed to come with the FF Ocean Forest soil. I tried diatomaceous earth heavily applied to the soil top (used 3 gallon grow bags.) I tried predatory nemotids which may have helped - didn't get rid of em though. Also tried BTI solution applied in a heavy soak. I used sticky traps throughout the grow and a TON of gnats were caught but I never got rid of all of them. A friend who grows commercially says that gnats eat only organics in the soil and not to worry about them. I dunno!!! I did yield a lot of bud from 6 plants under T-5's and CFL's and it did not seem that the gnats hurt anything but they were a PITA. I'd love to know more though so that next grow is better.

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I'd use a diluted drench of an organophosphate pesticide and be done with it. Diazinon or malathion would be your best bet. Dursban stays active too long and is not necessary. Or, if you run with the organic crowd, orange oil.

UB

my plants about 2 weeks old the 2 original lleaves are turning a dark green colour and a small bit brown... they also curled under... is this due to overwatering?

stoneyhigh said:

my plants about 2 weeks old the 2 original lleaves are turning a dark green colour and a small bit brown... they also curled under... is this due to overwatering?

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Could be due to alot of factors. Without knowing your everyday activities, it's anyone's guess.

ive added no nutes yet been watering it daily bout a half pint a of water a day its growin in miracle grow compost other than that its never touched...
its growin under a 7w cfl bulb which is in a homemade reflector made from a cut open beer can, the lights about 2 inches above the plant and is on for 20 hours a day...

Uncle Ben, if you have a few moments I'm having an issue with one of my plants.

Here's a link to my grow topic https://www.rollitup.org/cfl-growing/263995-my-cfl-grow.html and my latest post (with pics) in it https://www.rollitup.org/3324306-post15.html I have a white widow, santa berry, and blue dream. The WW is doing pretty good with lots of new growth but the other two aren't doing so well. The SB is just droopy and sad looking, with minor yellowing. But the BD is kind of worrying me because it's gone from having a few of the bigger leaves go yellow to having a yellow spot near the top and taking on an overall yellow hue.

Cliffs:
-I got the clones in 16oz. cups on the 25th and they were really dry, the plant in question was the driest of the bunch, with apparent nute burn showing on the 27th. I believe from the low moisture levels. There are pics in my topic.
-I watered with plain Brita filtered water until they drained for two waterings, on the 27th and a little more on the 29th with Thrive Alive B1 Green (http://www.technaflora.com/products.php?product=16).
-I believed they were showing signs of being rootbound that day because I could see root tips at the drain holes. The had pretty good root masses when I pulled them out to transplant on the 30th.
-I soaked the roots in the Thrive Alive per the directions (1/2tsp. to a qt.) for about 15 minutes, then transplanted into 5g buckets with a 2-1 perlite/vermiculite (two 8qt. bags of MG perlite and one 12qt. non-nuted bag) medium. The medium was saturated with a 1/4 mixture of the B1 prior to transplanting and then I gave them a cup each of nutes, with more B1, on top of where the rootball was. Total nutes should be 10-11-11 (4-1-6 from the perlite, 5-9-4 from Humboldt Oneness, and 1-1-1 from the B1).
-Transplant was done about an hour before lights out on the 30th.

Hey UB,

I would like to get your input regarding the photos I have attached of browning leaves on a few of my plants. I have my suspicions, but am not 100% sure what this is a sign of...?? If any additional info is needed just let me know. I am currently growing in Fox Farm, Happy Frog soil. I have fed approximately twice on a 1 in 3 feed rotation using Botanicare Pro Grow at 66% and 100% of recommended concentration, respectively. I have been watering about every 3 days in 2 gallon cheap nursery pots. RH is high, 55-71%; Temp ranged from 62-79 F in last 8 days. Initially saw signs of browning over the past 3-4 days, and has progressively gotten worse. Vegging 24/0 under 400W Hortilux Ace. My room has limited ventilation, although I am using an oscillating fan in a 7.5x7.5x9' space. I appreciate your insight, and thank you in advance! Cheers.

dakin3d said:

Hey UB,

I would like to get your input regarding the photos I have attached of browning leaves on a few of my plants. I have my suspicions, but am not 100% sure what this is a sign of...?? If any additional info is needed just let me know. I am currently growing in Fox Farm, Happy Frog soil. I have fed approximately twice on a 1 in 3 feed rotation using Botanicare Pro Grow at 66% and 100% of recommended concentration, respectively. I have been watering about every 3 days in 2 gallon cheap nursery pots. RH is high, 55-71%; Temp ranged from 62-79 F in last 8 days. Initially saw signs of browning over the past 3-4 days, and has progressively gotten worse. Vegging 24/0 under 400W Hortilux Ace. My room has limited ventilation, although I am using an oscillating fan in a 7.5x7.5x9' space. I appreciate your insight, and thank you in advance! Cheers.

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I look forward the UB's opinion, but that looks like a fungus to me.

Big pots, small plants, lot's of water, high RH.