Plant Moisture Stress - Symptoms and Solutions

DaveCoulier · Dec 29, 2010

GeeBee3000 said:
That article contains information I never thought of. It was a good lesson learned, thanks Dave.

Im glad you enjoyed it. Theres a wealth of information out there that most MJ growers haven't learned about. We tend to think that we can get all our information and knowledge here, and why wouldn't we? Its a marijuana forum, but unfortunately, most of the people on this board aren't as knowledgeable about plants and how to grow them compared to people who run commercial greenhouse operations, nurseries, etc.

A good site for information is http://www.greenhousegrower.com/magazine/

I like to read their magazine articles from time to time. The Understanding Plant Nutrition series they have is a good one. Go through their past issues and look around. Im sure you'll find something in there worth reading.

GeeBee3000 · Dec 29, 2010

GeeBee3000 said:
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!

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Hey what's up people? I went and bought a Caliber III Hygrometer for my poor Veg. Room and the read out said that the temperature was at 66o degrees F and the Relative Humidity was at 79%. Could this be the reason most of my plants look like this? Another question is how in the world do I get the humidity down without a dehumidifier?

DaveCoulier · Dec 30, 2010

Your humidity is too high for that temperature. Raise your temperatures and that will lower your humidity.

The high humidity isn't causing the drooping though. High humidity will cause your plants to be more rigid as its harder for them to release water to the atmosphere.

The most likely culprit is over-watering. Plants that size have small root systems, and due to your low temperatures and high humidity evaporation from the rockwool is reduced thus retaining excessive moisture longer.

haze713 · Dec 30, 2010

Hello, My temps in veg right now are 71-81 and RH had been 30%(now is 45%). I've had issues with little "cuts" showing up on leaves. My question is this: Can low humidity spawn random slices , cuts, and holes in leaves. I did bend a leaf tip and it broke easily. Also, I think PH is a bit high 7.5(working on getting that down). Not sure if PH can affect leaves this way. Very little browning on leaf tips. I flushed for good measure. The cuts I'm seeing are not browning or necrotic looking. I'm 100% sure it's not bugs. I placed sticky traps everywhere and nothing but a few fungus nats showed up. I'm very intimate with them multiple times a day and have never seen anything on them. Plant growth is steady and they look healthy. Lights are 120w triband LED and 150w HPS. HPS is about 12 inches away and LED is about 6-8". This is a soil grow that was mixed by me. Some pro mix, organic mix, and some compost that has been outside for over one year. I cooked that before mixing with my other soil. I may have over nuted early on based on some light tip browning but not browning on new growth. Some weird curling on random leaves though. I'm starting to thin I messed up somewhere badly. I do 3/4 strength nutes and water plain water 2x before adding nutes again. I let tap water sit 2 days. PH is 7.5(getting some ph down) My house is way to dry and I can only have a fan on for short periods or my humidity in the grow area goes down. I have added 3 18gallon bins full of water in my room. Added cold humidifier, and spray the room(not plants) as often as I can...still can only keep 45%rh.... My soil/run off test shows low nutrient levels. Light meter is not maxed at canopy.. out of 1-9 it's level 8. Let me know if more info is needed. I'll try to get a ppm reading in a few minutes and get a better picture of what I think may be issues to ask advice on. Thanks for any input!

businessmen · Dec 31, 2010

Hey, been fighting a losing battle for a year, trying to grow indoors. Tried everything I can think of within reason. But its getting worse. I clone, and normally they veg great, its in flower or when they filling in the pot that they start dying from the bottom up, fan leaves first. Its gotta be a disease, Ive tried copper and serenade sprays recently. Didnt help. I go light on nutes, tried tap, phd RO, more nutes, less nutes, organic, chemical different soil.... THANK YOU!!!

Calickored · Dec 31, 2010

Still having problems....I cannot seem to get my month old veggies to take HID lighting... I have two Sweet Tooth/ Trainwreck clones that will not repond positively to any wattage of Metal Halide lighting, I just recently noticed extreme transpiration when I put my babies under (1) 100W MH lighting and the older fan leaves continue to droop!
I do not water that often because my MG MC medium stays moist for about a week, I do not fertilize at all because I've used premixed MG with a good dose of BLooD meal, Kelp dust (liquid Kelp dried), Bone meal and one spritz of Bat guano.
I noticed over fert when I transplanted but It was easily and quickly corrected and my babies exploded with new growth and very short internodal spacing! Now as my plants grow they will not take any HID lighting no matter the distance from the canopy, they like my (1) 15W GE Chroma 50 fluoro and thats it!
Could I have a new strain of (low light response) cannabis here?
Also, I would like to tell you that I've noticed alot of differences over the years as I use very dilute Progesterone ferts. I have experimented with alot of things and one of the most beneficial to my gardens is estrogen and progesterone. I've noticed 100% chances of getting females as the mjor result. This is from proven testing over the last 8 years of outdoor and indoor growing not only in Cannabis but other perennial plants as well. I guess what I was asking is that what affects would it have for potential users of the final product? Could it make male users grow tits or make them whiney like alot of women!? Could it make women users sterile or less fertile? I guess I ask this because of moral issues, I do not want to mutate others when I allow them to smoke my product! Also, I've noticed that some strains like the weed you find in mersh or mexi mid grade bags, the seeds respond much more when the birth control is used and that the leaves take on a red color and grow rapidly. Example, when I first started using BC I had three seeds of the best schwag I could find and grew them under 24/0 lighting for 6 months and they grew to the tops of my grow area which is about 10 feet and the biggest fan leaves were about 18" long, did I mention that I never had to change the photoperiod to induce flowering!?!?! The three plants havested over 6 pounds of dry sensimillia and it smelled like wintergreen or peppermint and it was Deep Crimson, from leaf matter to stigma...it was RED! I think I may be on to something with gentic modification here with Cannabis!!!
Let me know what you think and what might be the problem with my Toothwreck clones. Thank you

killacreepz · Jan 1, 2011

good information well done

convict156326 · Jan 1, 2011

hey uncle ben, you seem to be a VERY knowledgeable person. im havin waterin issues. my girls showed over watering symptoms, but you say "5. Underwatering - not only is the plant now stressed due to a low supply of adequate moisture, but carbohydrate production has been greatly compromised (screwed up). Step up the watering frequency, and if need be, organic growers may need to soak the pot from the bottom up until moisture levels reach an even consistency throughout the medium especially with mixes that are heavy in peat. If severe, a little surfactant (liquid Ivory dish soap) added to the drench will help return the organics back to a normal moisture retentive state. If the pot feels light to the lift - its time to water. Dont wait until the soil pulls away from the sides of the pot or leaves droop before you water." that was how i would judge. i would water when the soil pulled inwards. earlier you mentioned about watering from the bottom. i check the drainage holes in my 3 gal grow bags, but have never even gotten the bottom of it oist. i thought this was bad. thanks for confirming. would you have any suggestions how i should properly water ? i just started my nute cycle. week one, splitting just 1 2 liter bottle between 6 plants with a 2.5ml/gal grow juice nute mix.

lbezphil2005 · Jan 3, 2011

Calickored said:
Still having problems....I cannot seem to get my month old veggies to take HID lighting... I have two Sweet Tooth/ Trainwreck clones that will not repond positively to any wattage of Metal Halide lighting, I just recently noticed extreme transpiration when I put my babies under (1) 100W MH lighting and the older fan leaves continue to droop!
I do not water that often because my MG MC medium stays moist for about a week, I do not fertilize at all because I've used premixed MG with a good dose of BLooD meal, Kelp dust (liquid Kelp dried), Bone meal and one spritz of Bat guano.
I noticed over fert when I transplanted but It was easily and quickly corrected and my babies exploded with new growth and very short internodal spacing! Now as my plants grow they will not take any HID lighting no matter the distance from the canopy, they like my (1) 15W GE Chroma 50 fluoro and thats it!
Could I have a new strain of (low light response) cannabis here?
Also, I would like to tell you that I've noticed alot of differences over the years as I use very dilute Progesterone ferts. I have experimented with alot of things and one of the most beneficial to my gardens is estrogen and progesterone. I've noticed 100% chances of getting females as the mjor result. This is from proven testing over the last 8 years of outdoor and indoor growing not only in Cannabis but other perennial plants as well. I guess what I was asking is that what affects would it have for potential users of the final product? Could it make male users grow tits or make them whiney like alot of women!? Could it make women users sterile or less fertile? I guess I ask this because of moral issues, I do not want to mutate others when I allow them to smoke my product! Also, I've noticed that some strains like the weed you find in mersh or mexi mid grade bags, the seeds respond much more when the birth control is used and that the leaves take on a red color and grow rapidly. Example, when I first started using BC I had three seeds of the best schwag I could find and grew them under 24/0 lighting for 6 months and they grew to the tops of my grow area which is about 10 feet and the biggest fan leaves were about 18" long, did I mention that I never had to change the photoperiod to induce flowering!?!?! The three plants havested over 6 pounds of dry sensimillia and it smelled like wintergreen or peppermint and it was Deep Crimson, from leaf matter to stigma...it was RED! I think I may be on to something with gentic modification here with Cannabis!!!
Let me know what you think and what might be the problem with my Toothwreck clones. Thank you

If you are using mg it hase nutes alredy in it, you are overnuting your young plants by adding the other stuff. get rid of mg, get some ffof or happy frog, no nute for the first 30 days.

businessmen · Jan 3, 2011

Any ideas on my post ?

convict156326 · Jan 3, 2011

same problem i had, stop watering as often, has been hard as hell for me not to water, but in my journal you can see the difference. but thats just a guess. pics help

Shrubs First · Jan 3, 2011

swazinuggz said:
im having leaves that are slightly curling and the large fan leaves are turning yellow and getting rust colored spots on the and then dying, the worst one is in a CoCo/soil mix in a 5gallon pot i water itwith 3-4 10oz cups every 2 days NE HELP?

You need to water more. 32 oz is a quarter of a gallon, every 2 days in a 5 gallon pot.

You need a half a gallon a day for a full sized plant in a 5 gallon. Or a gallon every other day.

Thats what it sounds like. Although it is difficult to diagnose non nutritional disorders without
visual inspection.

riddleme · Jan 3, 2011

swazinuggz said:
interesting, o thought i was giving too much water...but is ur opinion based on straight soil or CoCo block as well? cause ive grown for comercial grows and they used hydroton/CoCo mix in 5 gal pot and i was only giving the plants about an eighth a gallon everyday and nutrients every 2 or 3 days if they were organic tea plants i gave nutrients everyday...and do u really think that the rust colored spots on the yellowing leaves is related to the amt. of water? i was thinking that since iwas givng higher amounts of potassium than normal ,due to a recent deficiency, than it fluctuated the Cal-Mag levels especially since its CoCo block were talking of which is known for this and that they had a calmag deficiency and which caused the curling...

Shrubs knows CoCo, best thing you could do is post a pic

Shrubs First · Jan 3, 2011

Thats definitey possible, if you spike the K in Coco you'll have calmag lockout easy.

Especially if your media is drying out fast.. Do you receive runoff?

Alganj · Jan 9, 2011

HELP THIS NOOB OUT PLEASE

Hey....... I got droppy leaves on my Royal Queen super kush #1.

Can anyone help.

I got the plant in a small container DWC with vigorous air and stones bubbly. I have the water level about 1 inch below the bottom of the net pot. The roots are not massive , but are touching the water and alto of roots are out of the water. I have several other DWC plants and they are fine and kept at the same water level below the net pot.

The leaves have been droppy for a few days now. Last night the room got down to 58 degrees. I think that might have something to do with it.

They are under 1000W MH 26 inches from this particular plant. plenty of fans and air movement.

Humidity is 20-30% and then at night for 5 hours, the humidity gets up to about 60-70, so I was hoping that this period of high humidity would help moisten the plant and offset the low humidity.

Please help. ohhh.. I also just fimmed it a couple days ago.

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Shrubs First · Jan 12, 2011

Looks to be a lack of oxygen in the root system. But you say you have plenty of it?

26 Inches from a 1000W seems quite close. Especially for a plant that size, I keep
my 1000's 36 inches from my plants.

What is your TDS?

Alganj · Jan 12, 2011

Ive been keeping the ppm around 400-550 for the little one and about the same for the larger SLH. It seems to be fine now. I noticed the temp spike in my GR and it got down to 58 degrees one night. I think that was it. REp for helping

Shrubs First · Jan 12, 2011

Alganj said:
Ive been keeping the ppm around 400-550 for the little one and about the same for the larger SLH. It seems to be fine now. I noticed the temp spike in my GR and it got down to 58 degrees one night. I think that was it. REp for helping

Low temps will definitely slow water movement. Purple veins are a common side effect
of slow water movement.

GeeBee3000 · Jan 13, 2011

DaveCoulier said:
Your humidity is too high for that temperature. Raise your temperatures and that will lower your humidity.

The high humidity isn't causing the drooping though. High humidity will cause your plants to be more rigid as its harder for them to release water to the atmosphere.

The most likely culprit is over-watering. Plants that size have small root systems, and due to your low temperatures and high humidity evaporation from the rockwool is reduced thus retaining excessive moisture longer.

Hey what's up Dave, you have help me solve some plant problems in December so let me start by saying thanks again. Here's my question; I have some plants in the vegetation stage that have been growing in 6X6 inch Rockwool cubes for 3 weeks. They appear to have purple stems. I was planing to move them to flowering but I wanted to ask you if this was a plant problem I should address before doing so. I have received and found info but I wanted know if you had any literature or opinions about plants with purple stems.

HererBorealis · Jan 24, 2011

Hi there UncleBen! How are you? I'm well. I just joined the community a few days ago, and posted up my problem in the forum. I had a very prompt reply from another new member (thenotoriousone), and was wondering if you might mind taking a gander at my problem (as you are very knowledgeable in the area of cannabis cultivation

)

https://www.rollitup.org/marijuana-plant-problems/402641-over-watering-issue-solved.html

Anyways, thank you in advance for your time, look forward to hearing from you soon,

-HererBorealis-

P.S. Tried to send you a private msg, but says your box is full... Sry to post my link on your thread...

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