one plant leaf curl. the rest all good. anyone know why?

[Ford Fairlane]

Sorry for the crap photo's but it's all I have unfortunally. so If you can see the single plant photos have some leaf curl going on. but the rest are not curling.

medium= searls premium/perlite, 90/10

nutes= chrons super sauce, green dream flowering nutes

 

It's been 5 days since they last had any nutes, they have been rained on a bit and I have given them some water out of the tap.

 

The only thing I can come up with is maybe getting to hot in the corner for that one plant..

Is leaf curl a sign of heat stress?

 

 

 

edit* green dream nutes is flairform

Edited March 29, 2012 by puka

[Brimstond]

Looks like a little over feed and a little wet maybe dont know ....id flush and drain well then give it 3/4 strength nutes of what ever your using

your using potting mix and perlite so it will take longer than hydros for it to bounce back to a1 health

 

maybe

 

could also be just a different strain/ pheno that doesnt like strong nutes ? seeing that its only the one plant curling you rekon ......maybe put it in a seperate pot and feed it weaker nutes the the rest

 

Cheers Brimstond

Edited May 9, 2012 by Brimstond

[Frazz]

its clawing isnt it .. ive had that before but never been able to nail down the exact cause but it seemed to go away by itself too ... heat might be a factor but im only guessing

come to think of it ive never had it outdoors only indoors

 

[Ford Fairlane]

The leaf curl hung around but didn't seem to affect growth so didn't worry about it to much..I actually pulled it yesterday, had an infestation of gnats in the medium.. That plant was looking soo good was gonna be one big bud.. then the gnats started.They got stuck all over the friggin thing.. thousands of the fuckers stuck to the buds, growth slowed considerably.. the gnats started getting into the other plants so pulled the bitch and gave the pot full of soil to the chooks, which they devoured rather quickley... So now I have a halfmature plant hanging in the cupboard with gnats all over it..Thought to get em off i might try water curing.. then i'll hash it , It has loads of clear-cloudy thricomes all over it..OH WHAT A WASTE!!!

[brick]

Solving Marijuana Plan Leaf Curl/Cupping Problems

Plenty of first time and experienced marijuana growers will suffer at some point in their cannabis growing career marijuana plants that begin to show leaf damage.

Often they write emails or post on forums.

“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 another marijuana grower inspects the damage a true assessment might not be possible. It's hard to tell "exactly" what the culprit is. Unfortunately the “solution” the marijuana grower chooses many times is not the right one.

A misdiagnosis only serves to make matters worse by promoting further decline.

The ultimate and correct solution is in the hands of the marijuana grower.

Here are some common problems when marijuana leaves are curling.

Too much marijuana fertilizer

The most common cause of marijuana leaf cupping aka leaf margin rolling, leaf margin burn, and leaf tip curl/burn is overzealous use of marijuana plant food. In relationship to factors such as marijuana plant vigor and rate of growth. Leaf burn is often the very first sign of too much marijuana fertilizer.

A hard, crispy feel to the marijuana leaf frequently occurs as well, as opposed to a soft and cool feel of a happy pot leaf. Back off on the amount and/or frequency of using marijuana fertilizer. Too much marijuana fertilizer can also burn the roots, especially the sensitive root tips, which then creates another set of problems. Note - as soil dries, the concentration of the remaining salts rises further exacerbating the problem.

High Heat

The marijuana plant is losing water via it’s leaves faster than what can be replaced by the root system. The marijuana leaf responds by leaf margin cupping or rolling up or down (most times up) 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 upward/inward with the grass taking on a dull, greyish-green appearance. Upon sunrise when moisture levels have returned to normal, the leaf blade will be flat. Lower the heat in the marijuana grow-op and concentrate on developing a large robust root system. An efficient and effective root system will go a long way to prevent heat induced pot leaf dessication or marijuana leaf margin curling. One short episode of high heat is enough to permanently disable or destroy leaf tissue and cause a general decline in the leaves affected, which often occurs to leaves found at the top of the cannabis plant. The damaged pot leaf (usually) does not fully 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.

Too much light

Yes, it’s true, you can give your marijuana plant 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, dust, twilight periods in the 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 marijuana leaf cupping, but it often goes hand-in-hand with high heat for indoor marijuana growers. Turn down the time when the lights on in your marijuana grow room. If you're using a 24 hr cycle, turn it down to 20 hrs. Those on 18 - 6 marijuana growth cycle can turn their lights down two or three hours. Too much light can have many adverse effects on marijuana plants. Concentrate on developing/maintaining an efficient and robust root system.

Over Watering

For marijuana growers using soil, this practice only serves to weaken the root system by depriving the roots of proper gas exchange. The marijuana plants roots are not getting enough oxygen which creates an anerobic condition inducing root rot and root decline with the end result showing up as leaf stress, stunted growth, and in severe cases, death. Over watering creates a perfect environment for damp-off disease, at, or below the soil line. Many times marijuana growers believe their cannabis plant is not getting enough marijuana fertilizers (which it can't under such adverse conditions), so they add more marijuana fertilizers. Making the problem worst. Not better. Often problem 1 and 4 go together. Too much marijuana fertilizer combined with too much water. Creating plenty of marijuana plant problems.

Not Enough Water

Not only is the marijuana 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 marijuana growers may need to water from the bottom up until moisture levels reach a norm throughout the medium. One of the best methods in determining whether a marijuana plant requires watering is lifting the pots. The pots should be light to lift before a water session. After watering the marijuana plants lift the pots to get an understanding how heavy they've become fully watered. If the pot feels light to the lift - it’s time to water. Don’t wait until the soil pulls away from the side of the pot before watering. And of course, leach, once in a while to get rid of excess salts. These are the five most common problems marijuana growers encounter when growing cannabis. Correcting the problems early will save the marijuana plants, but may reduce overall yield. With practice and experience these problems are easily overcome which will then enable the marijuana grower to produce fantastic marijuana plants. With heavy yields

[Brimstond]

Pretty much covered that then brick aye ... ........

 

f-ing good info in that brick .......I'm gonna cut and paste that so I can print it out and give it to friends who are getting into hydro at the moment

 

Cheers Brimstond

[brick]

Yes Brim it is all out there on the net. Just takes a bit time finding where! But worth it if it is going to save some stress for the plant and the grower.

[Ford Fairlane]

It certainly appears to be acomplicated issue. Thanks for the advice Brick

[brick]

Puka it is only as complicated as the grower wants it to be. I found the above on a seed bank site, copy and paste. One of the biggest problems new growers face is panic, when they see their plant/plants starting to get sick. If there are many answers to one problem, then the grower should try and keep calm and try one thing at a time and wait to see if you get a good result, if not go to the next solution try that and wait. One of the biggest problems is over watering. I thought for long time when I stated to grow in soil in pots that I had to give the plant plenty of water, you know mates giving advice and they really new no more than I did. I drowned many plants, before I woke up that I was the problem. Eventually you get it right and then the rewards come.

Patience and clear thinking is the start to good buds. Then the fun begins.

[hidden.monkeys]

Bummer about the gnats mate. They can be a right nightmare by the time you realise you have an infestation. Surprising you didn't see any flying around the place to alert you to them earlier.