Plant Moisture Stress - Symptoms and Solutions

Discussion in 'Marijuana Plant Problems' started by Uncle Ben, Jan 12, 2009.


    420producer Well-Known Member

    here are my latest pics
    strawberry bananas sherbet. in 15 gal pots and sour d in same size week 5 and week 7 on sour about 6 ft. tall

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    G.IGrowBoss likes this.

    danzibar1234 Member

    Please help i think I transplanted late and my humidity is only 30% will they come back around or should I bin them

    I have bought a hr15 humidifier and it can only get Upto 42%
    With my extraction turned down as much as possible temps in the room 27.5

    Strain stardawg

    20 days old from cutting

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    chuckie86 Well-Known Member

    Can anyone help not sure whats going on with my plants

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    SoCalCraw Member

    What's the environment you've got your plant under? Humid/dry? Hot/cold? What light are you using? What nutes and how often are you feeding?

    SoCalCraw Member

    I've also got a problem of my own on my hands, I'm hoping someone can help me!!

    I've got a 15 plant limit, no rules on how many in flower at a time just 15 total root systems and plan on putting them in a 16x7x7 shipping container that's insulated to withstand temps in the -30 to -40°C and am definitely taking notes on cleanliness.

    I recently just purchased a 1000W HPS that Im using in a 2x4x7 closet that is running AC to the bottom of the Grow box (that's within the closet) and allowing to rise to the ceiling along with 2 CPU fans and a little area fan to circulate the air best as I can. Temp stays at about 26°C with a 30% RH with the lights on, with the lights off it stays at 20°C with a 50-55% RH.

    Previous to putting an AC unit in the closet there was just the fans, exceeding temps of over 30°C and having a RH of close to 60% and I would say for a good day, causing enough heat stress to
    slightly taco my lady's leaves, the blades are coming up but the leaves aren't necessarily 'cupping'.

    My question is, is this cupping reversible if I'm able to keep the temps controlled at the current ~26°C/30% DAY vs. ~20°C/50% NIGHT? Is there any way to reverse cupping?

    I've got one super auto NL that's about 3.5 feet tall (having to bend her over because the lights too intense) that's under the 1000W she's on her 8th week of life out of about "10-12". Buds are forming nicely but they have a bit of a damp smell to them. I've inspected every little bit between her and there is absolutely no sign of mold, just that wet towel smell. I'm a little lost there also but it must have something to do with the humidity. Some leaves also have some yellow spotting I'm assuming due to that one bad heat wave they endured when I first got my light.

    I'm just trying to get dense, good smelling nugs because I have the power just not necessarily the skill, and that's why I'm reaching out to those who do!

    Here's a picture to get a better sense of what I'm dealing with, unfortunately my set up is super ghetto at home since I'm spending literally all my money on insulating those shipping containers for the harsh Canadian winters so please bare I appreciate you all in helping out in the medical and recreational cannabis communities, especially for Canadians at least it's not easy to find this information freely available from someone with experience!!

    PS: this is my first grow! Please shoot out any constructive criticism! Just please don't be too too mean :) thanks again!!

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    Ag3life Member

    HELP!!!!! She looked good just a few hours ago.

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    SoCalCraw Member

    What are your temps like? And how much water/ how often?

    Ag3life Member

    I have kept my temp between 70-80 degrees. I've been watering every 2-3 days. How much run off am I suppose to have when watering?

    Michiganjesse Well-Known Member

    First grow doing pretty good leaves may not come back doubtful. but they should be just fine to continue

    SoCalCraw Member

    The runoff will all depend on your plants root systems and how much the dirt around them is soaking in and holding on to so it's hard for me to tell you the answer on that one.

    A good test i like to do Is to measure the amount of water before I give it to a plant (if you're not worried about ph testing your runoff all the time), let's say 1.5L. Place the pot over a large bowl so there's room between the bottom of that plants pot and the bottom of the bowl for your runoff to go into. Make sure however your plant is decently dry, and pour that water on the plant, after it stops dripping lift the pot and take out the bowl, measure the water in your bowl, let's say .25L. (1.5-.25)That means your pot is able to retain 1.25L of water without runoff which is key to getting the farthest root tips water and not overwatering it by keeping the bottom constantly moist.

    I hope that helps a bit and I hope your babies perked back up!!!!

    chuckie86 Well-Known Member

    Yea buddy they just need some water

    SoCalCraw Member

    Update on my own heat stress question earlier:

    70% of the leaves coming off the buds had some form of heat stress, either taco or edges lifting up, but the harvest was actually pretty good.

    I got 2oz dry and cured from a Northern Lights Autoflower Feminized grown under 150W of T5 and then put in flower under a 1000W Agrolite with a fire retardant thin ass sheet to soften the strength of the light hitting the plants since it's in a closet (I got super lucky with that find, I don't suggest doing that unless you're absolutely desperate at the time, which I absolutely was) and in soil (miracle grow potting mix).

    I want to let people know that these plants are very very very hardy, I can't repeat that enough. When I saw all of my leaves starting to taco I did immediate action (added AC unit, boxed in grow area for easier ventilation, stabilized temps between day and night, etc) since I was in a panic and I learnt from those experiences that much worse things could have happened. The plant won't die unless you stress it out with heat above 90° for HOURS. Don't let the taco's by your nugs push you down as they did to me, your plant still has plenty of other leaves down the branch to support the growth of buds on them that you might not think are enough but definitely will be (in terms of Autoflowers).

    I can't say the same for non auto's since pruning and other techniques will probably (idk) make it so that if there is heat stress the plant won't have enough other leaves to rely on and I'm assuming as a result could have a higher chance of dying due To a heat wave even after you might have fixed the problem.

    Ag3life Member

    Thanks for that tip!!!!
    SoCalCraw likes this.

    Ag3life Member

    yea they are looking great now. i notice that they bounce back fast.

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    BBbubblegum Well-Known Member

    Humidity is too low. Start spraying them twice a day

    STX.OrganicGuerilla Active Member


    710revolution Active Member

    Heres an extreme overwatering caused by a bad mistake on my part. Been on vacation the past week since 3/23. I overcompensated on what i thought my plants would drink, and i ended up overwatering them. Rookie mistake, and ive been growing off and on for over ten years. Its been dry for the past month and a half. They were drinking a lot before i took off last week. So im like ill soak them. I ended up drowning the bitches. It sucks balls, but i should have watched the forecast closer to see there was going to be a mini monsoon hitting home during the same time i was going to be gone. Relative humidity is at 70 freaking percent, so naturally my girls were not drinking as much as usual. I only went off what ive been doing the past 10 weeks. Not reading my plants or their grow enviornment. This has been a rough grow as it is because,well, life. Only the one plant is questionable to be able to finish. However, im pushing it anyway, to finish the grow. The others i am confident will finish out. Got two unknown strains. Which are the two obviously bigger plants. The other two are trainwreck auto from crop king seeds. 2ft×2ftx4ft tent with cheap ass blurples. Ive been running them all 12/12 for 3 1/2 weeks, 24hr a day before that. Gives a good visual of what overwatering looks like. Wrecks shit.

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    Moose Moss

    Moose Moss New Member

    Great article Ben. I am attempting my third indoor closet grow, i really screwed up the first two grows somehow. i used to much or to little light, Over fertilizing, over watering and or to much heat from lights now that is said, how would i know which stage to give the plant nutrients and how much light to use if only growing one or two plants? Why do some growers use calmag or molasses etc. I hope I didn't hit you with too many questions but seems like a lot of people have different theories on indoor growing.
    Thxs Moose

    jbcCT Active Member

    I'm very liberal with my watering. Recently fed a few girls, then had rain, very moist for two days straight. Had some cupping last night. One bright sunny day today, mid 70's nice sun, cured cupping.

    I'm a less is more guy when it comes to water & nutrients. I've always found my outdoor crops thrive on the dry side. I'm a firm believer most strains like it dry.

    itsmeifti Member

    Hi, can an expert let me know what is the problem with these? White spots on lower leaves - eventually 'crisp' and 'burn off'

    3 x OG Kush, planted 7 may 17
    All in one soil/nute mix ( 4 months release)
    Context - been very wet over the last 2/3 weeks
    Have tried onion/garlic puree on leaves last few days as a pesticide?
    Advice welcome! IMG_20170607_143814.jpg IMG_20170607_143823.jpg IMG_20170607_143832.jpg IMG_20170607_143841.jpg

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