Plant Moisture Stress - Symptoms and Solutions

Can anyone tell me what this might be necrotic edges very dark green. No nutes straight distilled ph d water to 6.3 helppp pics are from the last 2 weeks to now
 

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Boru420

Well-Known Member
im in the last 2 weeks of flower for an auto, maybe even a week, but ive noticed the humidity dropping in my tent what was 50-60 is now 30-40, is this normal or a problem.
 

Morsey81

Member
im in the last 2 weeks of flower for an auto, maybe even a week, but ive noticed the humidity dropping in my tent what was 50-60 is now 30-40, is this normal or a problem.
Flowering stage should be in between 40-50. 2nd stage of flowering 35-45%. Keep it above 30%
 

Morsey81

Member
Sorry miss read didnt see you said last 2 weeks of flowering. 35%-40% is what you want. 30% may be a little to low but wouldnt hurt it but if it goes below 30 ull need to raise it. If you dont have a humidifer you can boil a pan of water and place it in ur tent but keep an eye on it raised humidity quick. A small USB humidifer works perfect to keep it at 35-40.
 

Gorillaglue024

New Member
PLANT MOISTURE STRESS - symptoms and solutions (revised Jan. 12, 2009)

Quite often I hear groans from folks having leaf problems -> “Help, my leaves are cupping and the leaf edges are turning brown!”, or, “My plant's leaf tips are curling down and turning black ....what's wrong?” Unless insect damage has occurred or the plant is suffering from a severe case of calcium deficiency, the plant is trying to tell you that it is water stressed. It's hard to tell *exactly* what the culprit is, and unfortunately the “solution” the grower chooses many times is not the right one. A mis-diagnosis only serves to make matters worse by promoting further decline. I’ll try to cover some of the more common causes that can induce these common symptoms and try to offer a few simple solutions. The ultimate and correct solution is in the hands of the grower.

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.

2. High Heat - the plant is losing water via it’s leaves faster than what can be replaced by the root system. The leaf responds by leaf margin cupping or rolling (up or down) in order to conserve moisture. A good example is reflected by the appearance of broad-bladed turf grass on a hot summer day, high noon, with low soil moisture levels - the leaf blade will roll in and the grass will take on a dull, greyish-green appearance. Upon sunrise when moisture levels have returned to normal, the leaf blade will be flat. Lower the heat and concentrate on developing a large, robust root system by practicing sound plant culture. An efficient and effective root system will go a long way to prevent heat induced leaf dessication and leaf margin curling by supplying sufficient moisture for good plant health. One short episode of high heat is enough to permanently destroy leaf tissue and cause a general decline in the leaves affected, which often occurs to leaves found at the top of the plant located near HID lamps. The damaged leaf (usually) does not recover, no matter what you do. Bummer in the summer. One can only look to new growth for indications that the problem has been corrected.

3. High Light - yes, it’s true, you can give our faves too much light. Cannabis does not receive full sun from sunrise to sunset in its natural state. It is shaded or given reduced light levels because of adjacent plant material, cloudy conditions, rain, debris and dust collection on the leaf surface, twilight periods of early morning and late afternoon, and light intensity changes caused by a change in the seasons. Too much light mainly serves to bleach out and destroy chlorophyll as opposed to causing leaf cupping, but it often goes hand-in-hand with high heat for indoor growers. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. Keep in mind that all but equatorial material receive less light during flowering than during the vegetative stage.

4. Overwatering - this practice only serves to weaken the root system by depriving the roots of proper gas exchange. IOW, the roots are not getting enough oxygen which creates an anerobic condition causing root decline and root rot with the end result showing up as leaf stress, stunted growth, and in severe cases, death. <gasp!> Alot of times folks think the plant is not getting enough plant food (which it can't under such adverse conditions), they add more nutes for a "curative", and just add insult to injury.

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 - it&#8217;s time to water. Don&#8217;t wait until the soil pulls away from the sides of the pot or leaves droop before you water.

Happy gardening,
Uncle Ben
Does natural rain water contain microbes that are beneficial to plants?
 

Coodyscoops

Member
If I could choose the best grower on this forum, you would be it in 5 seconds...

i have learned through trial and error that i love my plants a little too much. What i do now is i allow the plant to use the soil until she tells me that she is hungry and instead of depending on the top soil, i just stick my finger or a long stick to see if she needs water... i never understood how a watering schedule works because no two waterings are ever the same
 

TheBudMan2522

New Member
I need some advice on my plants they are just not doing the greatest. I did have ph problems with my water source it was extremely low and adding nutes into it made it worse. I completely flushed with ph water around 7. The ph of water coming from pot was around 4.4 - 5. I’ve gotten that up to 6 with the flushing. I’ve read having between 6 and 6.5 is best for coco coir. But I haven’t seen any major improvements and leaves keep turning brown and crispy and dying. These pictures are from a day and a half after neutral ph flush. Temp in tent is 77-80 deg and humidity stays around 30-50. Any ideas would be greatly appreciated.
 

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Gorillaglue024

New Member
I know this is a old thread but is there anyone on here who could help me Define what these pictures are showing
Ph issues in water I'm thinking my plants looked like that before I was using tap water then I started melting the ice cycles off my roof and watering them with it and it went away no build up of calcium or chlorine and its natural I'm guessing it's better to water with a low ph so u not adding or get a build of of nutrients
 
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