Plant Moisture Stress - Symptoms and Solutions

[smokinHerbOnDaCurb]

Great thread UB, thanks for the info.

Question for you...I am on week 3 bloom and just started adding Fox Farm Tiger Bloom in addition to what I have been adding - Fox Farm Big Bloom and Open Sesame. I nute every other watering with the first application of Tiger Bloom two days back. Yesterday, the day after the first app of Tiger, I noticed two plants that were nice dark green in color have gone yellowish. The leaves still look healthy and they haven't stopped blooming, but the yellow color worries me. Do you think I overdid it on the nutes? All the others still look green and healthy, why would only two or so be affected?

Thanks in advance for any support you can provide.

Your not overwatering them are u. You might of over fertilized them . Then agian it could be your lights. The yellowish of some leaves are nomal but more than a few could be a sign of a problem

 

[MoppinSauce]

Your not overwatering them are u. You might of over fertilized them . Then agian it could be your lights. The yellowish of some leaves are nomal but more than a few could be a sign of a problem

Definitely not overwatering, I go at least 3 days between and finger check daily. I have not added any veg nute tho as the Ocean Forest was pretty stacked in that regard. But, the yellowing just started after the first application of the Tiger. I am hoping when the lights go on I don't see others affected as well. They were all 100% healthy before the app of Tiger so I think I overdid it. Will they recover to the beautiful dark green I was enjoying over time? I don't think it's an N deficiency, but it could be given I haven't really given any veg nutes at all. Next feeding is straight water but after that I think I will dose with the FF Grow a bit. Suggestions welcome.

Thanks

 

[Uncle Ben]

Great thread UB, thanks for the info.

Question for you...I am on week 3 bloom and just started adding Fox Farm Tiger Bloom in addition to what I have been adding - Fox Farm Big Bloom and Open Sesame. I nute every other watering with the first application of Tiger Bloom two days back. Yesterday, the day after the first app of Tiger, I noticed two plants that were nice dark green in color have gone yellowish. The leaves still look healthy and they haven't stopped blooming, but the yellow color worries me. Do you think I overdid it on the nutes?

They are reacting to a NPK that doesn't support healthy green leaves. Too much P and not enough N. It's typical of the cannabis trade.

All the others still look green and healthy, why would only two or so be affected?

Beats the shit outta me. Perhaps they need more N.

Good luck ~

 

[cloneup]

great thread, i was wondering what you think is wrong here, they were doing great, nice root, nice green, 4 days ago i cut clones, put in bigger pots, fed yesterday, put them in bud, and this is what i woke up to today, advice? would be great, thanks

 

[lovetotoke420]

Please help, my plant look ok indicas short and good color, but when I give them water one or two leafs simply turn sideways or almost upside down. I was givin a little to much water , and started giving less . did I give to little water or what?
Thank a bunch to anyone that helps me!!! Keep on smoking!!!

 

[Uncle Ben]

great thread, i was wondering what you think is wrong here, they were doing great, nice root, nice green, 4 days ago i cut clones, put in bigger pots, fed yesterday, put them in bud, and this is what i woke up to today, advice? would be great, thanks

1. Did you "butcher" the root system as opposed to the rootball coming out clean and intact?

2. What did you feed them with and how much?

UB

 

[MoppinSauce]

They are reacting to a NPK that doesn't support healthy green leaves. Too much P and not enough N. It's typical of the cannabis trade.



Beats the shit outta me. Perhaps they need more N.

Good luck ~

Thank you sir. So, just add a bit of the Grow and I should be in better shape or don't add the Grow?

Thanks again.

 

[cloneup]

no butchering, they came out nice and clean, they have been fed Age Old grow 12-6-6 (1fl.oz per gal) 3 weeks ago, and 2 days ago were fed Age Old bloom 5-10-5 (1fl. oz per gal), i use fox farm ocean forest medium, they get about 2-3 cups of ph'd water (6.5) when needed

 

[Uncle Ben]

Thank you sir. So, just add a bit of the Grow and I should be in better shape or don't add the Grow?

Thanks again.

Since the Grow is higher in N, use it instead of the Tiger Bloom, which is what's inducing your leaf drop. Good luck!

 

[Uncle Ben]

no butchering, they came out nice and clean, they have been fed Age Old grow 12-6-6 (1fl.oz per gal) 3 weeks ago, and 2 days ago were fed Age Old bloom 5-10-5 (1fl. oz per gal), i use fox farm ocean forest medium, they get about 2-3 cups of ph'd water (6.5) when needed

1 fl. oz aka 2 Tblsp. per gallon!!!? Ouch! For indoor potted plants, 1 tsp./gallon is usually sufficient and 2 tsp. is pushing it. That's what's causing the leaf curl. It's a response to water actually being drawn out of the plant. Less is more.

Like I said in the ditty:

1. Over-fertilizing - the most common cause of leaf cupping aka leaf margin rolling, leaf margin burn, and leaf tip curl/burn is the overzealous use of too much plant food in relationship to factors such as plant size, vigor and rate of growth. The first unit of a plant to show moisture stress is the leaf at its margins and/or tips, reflected by margin rolling (cupping) or burning. Sometimes copper colored necrotic spots show in the leaf also. A hard, crispy feel to the leaf frequently occurs as well, as opposed to a soft and cool feel of a happy leaf. When you have a high concentration of salts in solution (or in the root medium) compared to lower salinity levels found in the plant’s tissue, water is actually drawn out of the plant across the root gradient in order to fix the ppm imbalance. IOW, this is a natural, osmotic response that serves to equalize salinity levels on both sides of the root’s epidermal gradient. Back off on the amount and/or frequency of plant food. Too much plant food can also burn the roots, especially the sensitive root tips and hairs, which then creates another set of problems such as nutrient deficiencies. A note for the bio folks - as soil dries, the concentration of the remaining salts rises further exacerbating the problem. Leach (flush) your pots once in a while to get rid of excess salts.

Comment about your watering drill - no need to measure in cups, measure in terms of a good runoff after you water. If I were you I'd flush those pots a bit with rainwater. Doesn't mean the affected leaves will return to a flat position, but it will correct a saline situation in the medium. Look at the new growth, not the old to verify if you're back on track. Your leaves are still productive, but if you don't get a handle on the moisture stress then they won't be....they'll be gone LOL.

If dealing with the maintenance of the runoff is an issue, do what I do. Drench the pots well and use a turkey baster to suck up the water from the saucers. Deposit it into a 1 gallon plastic milk jug and use this tea to water your indoor houseplants or veggie garden - they'll love it.

Good luck,
UB

 

[cloneup]

makes all the sense in the world to me, i'm not a nute guy, when i grow outside all they get is rain water and i never have problems, now what i did was seeing how i just repotted them the other night, i took the sopping wet soil out (left the rootball alone) and put new soil in, as for the rain water i'm out, i used my reserves on my last crop, but would melted snow work?


p.s. the measuring cup is just for reference on how much they eat, i do always water slowly till it trickles out the bottom

 

[Uncle Ben]

makes all the sense in the world to me, i'm not a nute guy, when i grow outside all they get is rain water and i never have problems, now what i did was seeing how i just repotted them the other night, i took the sopping wet soil out (left the rootball alone) and put new soil in, as for the rain water i'm out, i used my reserves on my last crop, but would melted snow work?

Tap water is fine. 1/2 dozen of one, 6 of the other. Rainwater has some nitrates, especially collected from thunderstorms.

Soil should never be "sopping wet". A healthy robust root system will wick off excess moisture....."sopping wet" will never occur under good growing conditions.

 

[cloneup]

they were only sopping wet for about 12 hours, i fed them till water trickled out the bottom, next day they were all sagging

 

[kalm325]

Just started a little micro gro and 3 of my 4 plants are doin alright but one is having alot of trouble. My best plant has some leaves curled under but thats just from the little humidity dome i had on there. been 2 weeks since i germinated them and there isnt even roots coming out of the rockwool except at the top a bit while my other plants have a good amount coming from the net. This is my first actual gro that i have cared about and was jw if anyone can help out. ty


sorry the camera sucks didnt have anything else at the time. I posted pics of all 4 im ok with the really short one but the tall shitty one in the 3rd thumbnail is bothering me alot. this was a few days ago but the 3rd one is still about the same.

 

[BlackGrape]

Hi! this is one of my first grow in numerous years and I have this problem as you can see in the picture. what's going on?! it's more of a yellow brown and only on one of the round leaves and then on the tip of one of the first true leaves, and each blade is pointing upwards. I transplanted yesterday into this larger pot and it seemed like it really took hold, it was doing really well. the light cycle is 16/8. should I keep the light on for more than 16 hrs?
​

 

[cloneup]

its been 3 days since i gave the snow water, and they have all turned around, all the new growth is perfect, and the big fans are all coming back up, hell yea, thanks UB for the straight forward help, seems hard to find these days around RU, again, thanks big time, +reps!!

 

[Uncle Ben]

Just started a little micro gro and 3 of my 4 plants are doin alright but one is having alot of trouble.

Without a complete overview on your garden, it's anybody's guess what is going on. Obviously it doesn't like the treatment it's getting. Re-read my ditty, the answer should come.

its been 3 days since i gave the snow water, and they have all turned around, all the new growth is perfect, and the big fans are all coming back up, hell yea, thanks UB for the straight forward help, seems hard to find these days around RU, again, thanks big time, +reps!!

You're most welcome.

Good thing that you are concentrating on the health of the new growth since that's all that matters now. Whatever damage has been done to the old....it will not recover.

Good luck,
UB

 

[Uncle Ben]

Hi! this is one of my first grow in numerous years and I have this problem as you can see in the picture. what's going on?! it's more of a yellow brown and only on one of the round leaves and then on the tip of one of the first true leaves, and each blade is pointing upwards. I transplanted yesterday into this larger pot and it seemed like it really took hold, it was doing really well. the light cycle is 16/8. should I keep the light on for more than 16 hrs?
​

Your anxiety and apprehension is getting the best of you. You can't know if "it really took hold" within 24 hours. Also, by moving it so soon you most likely butchered the fine roots and root hairs, not good.

I use 20/4 for veg, but it's all dependent on how much total light is received over a given amount of time regarding carbos produced, plus all the factors that weight in. Check out what "light saturation point" means.

Good luck,
UB

 

[kalm325]

Without a complete overview on your garden, it's anybody's guess what is going on. Obviously it doesn't like the treatment it's getting. Re-read my ditty, the answer should come.

I will get pictures of my whole set up soon. It is in a cardboard box right now, but within the week i will move it to a 6ft by 30ish in steel mylar lined cabinet with an vent system but right now all i have is a 12in airstone in a 3g tuberwear container with 3in baskets in rockwool. Im using Botanicare Pure Blend Pro Grow right now and have red the label and added 1/4oz per gallon H2O, so 4.75tsp for the 2.5 gal i put in the tank. I also have a small pump with a tube running through the side of the box that i pump the water out of the tank with. I run my tap water through a brita filter and let it sit for a day or 2 in a 5gal pail to distill it. all the other plants are fine, i even moved the plant around. When i get access to a camera i will post more pics of the plant. Thanks for your help.

oh ps. the formula says 3-1.5-4 on the front. im assuming thats the NPK but for some reason i remember reading that they are usually like 10-10-10 in a balanced solution but a few of my plants are growing very very well now with the nutrient content. its just that one little guy haveing problems.

 

[bdonson]

Hi Uncle Ben, I've enjoyed reading your posts I think my girl suffers from too much of a good thing 2 weeks into flower 400w hps, Scott soil, snow white, room temp is around 70, using connoisseur, well water ph 7,. From the reading I've done I guess nute burn tho hopefully not too bad yet. I flushed tonight with plain well water. Sorry about the poor pic but hopefully you can make out enough detail to be of some use. Basically new growth is affected curling/rolled up leaves. My plan is too continue to water with ph adjusted water and no nutes. What do you think? Cheers