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My leaves are curling up

Discussion in 'General Marijuana Growing' started by Jeff1022, Jun 4, 2011.


    Jeff1022 Member

    Please help: I am doing everything I can to figure this out with no luck. I thought I nutrient burned mt plants so I washed them out in 6.5 PH water 2 days ago. Now they are looking like the pic's attached can you Please give me some advice.
    PS I was going to put my grow room pic's on my profile but cant figure out how to do it .

    Attached Files:


    VLRD.Kush Well-Known Member

    Whats your temps running at? Mine did the same thing, then I added a few more fans and they "straightened" up

    woodsmaneh! Well-Known Member

    I'll send you the bill in the mail. I suggest you cut and paste for future reference. Let them dry out before water again. Always have a small fan blowing over the top of the pots, gently. This will dry out the top layer and help prevent fungus nats and also keep you Co2 moving.

    [FONT=&quot]Solving Marijuana Plan Leaf Curl/Cupping Problems[/FONT]

    [FONT=&quot]OK rule number #1 when you see this happening is flush with 25% nutrients; use 2 to 3 times the pot size to do this. Flushing means lots of run-off. You use 25% because some elements are not mobile without other elements, so if you have a mag lock up flushing with water won't get the mag out, as it needs nitrogen to be mobile. Your killing your plants with kindness remember they are weeds. Here are more answers for you, you might want to save it for reference later The only time you don't use rule #1 is in the last 2 weeks of flower when bottom leaves stop being used for photosynthesis.[/FONT]
    [FONT=&quot]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.[/FONT]
    [FONT=&quot]A misdiagnosis only serves to make matters worse by promoting further decline.[/FONT]
    [FONT=&quot]The ultimate and correct solution is in the hands of the marijuana grower.[/FONT]
    [FONT=&quot]Here are some common problems when marijuana leaves are curling.[/FONT]

    1. [FONT=&quot]Too much marijuana fertilizer[/FONT][FONT=&quot]
      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 vigour 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.
    2. [FONT=&quot]High Heat[/FONT][FONT=&quot]
      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 desiccation 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.
    3. [FONT=&quot]Too much light[/FONT][FONT=&quot]
      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.
    4. [FONT=&quot]Over Watering[/FONT][FONT=&quot]
      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.
    5. [FONT=&quot]Not Enough Water[/FONT][FONT=&quot]
      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.
    Air likes this.

    Shadeslay Active Member

    As pointed out cupping upwards is normally a sign the roots are having a difficult time supplying the leaves with enough moisture. Heat or intense lighting is often the cause.

    Jeff1022 Member

    Thank all of you from the bottom of my heart, I have a fan osolating on low , but thinking about it, I watched the High Times jorge cervantes ultimate grow dvd, on the 2nd dvd he does this thing on lighting & explaining lumens. The bottom line is he says the closer the light the better off you are, just put your hand over the seedlings and if your hand doesnt get burned your cool, I did that, my hand got a little warm but not bad: Just so you can understand, My room is 9' X 10' X 8' high, I have 4- 600 watt MH for lighting at this time, I have 2 - 20lb CO2 bottles running & I have a 12,000 BTU AC with a small Evaporative cooler that will dehumidfy also....The room is only 90sq ft or 720 ft3. The damn heat is killing me at night i run about 85-90 degrees Farenhight But during the day I have to run an additional swamp cooler or I will be at 112-115 easy, compounding this my co2 gets trashed because when I run the big swamp cooler the air pressure increases and comes out of my exhaust vent just humming. If I could only cool these lights down, I am financially streched so I am trying to figure out a way to solve this for under 200.00. My Friends Mr.Ganja & VLRD.Kush & Pot Head I cant Thank You all enough,I am so alone on this as these creeps around here will rip you off if they have a chance and I just dont put my or my friends business out there EVER. God Bless You all each and every one.

    Jeff1022 Member

    Oops I forgot! Mr.Ganja, I did Exactly what you told me to do and I did print this, you are gifted and Thanks again for taking the time to help me out.

    Shadeslay Active Member

    For the swamp cooler try opening other windows in your house to release the back pressure. You can also adjust the speed down from up top as well.

    For your heat problems look into getting some vented hoods or cool tubes. You may even be able to use the pressure from the swamp cooler to push the air through the carbon into your hoods then vent outside. Although I doubt it, but I know it's something I would try.
    The White Buffalo

    The White Buffalo Active Member

    IMO a little(ok a lot!) overkill in the light department for how far along your plants are. I'd drop out a few of the lights for now until they are bigger. Cheapest way to solve all your heat problems :) I'd be running just one at this point to save a little coin.

    And your bigger plant is showing some nutrient deficiencies.....

    Jeff1022 Member

    Mr. White Buffalo That name is cool as hell I know the story :~) I did what you said and reduced the light I went from 4 to 3 but as I put my Babies into 3 gal containers they take up room and the best I might be able to do is 2 lights I also raised the lights and all is better because the swamp cooler is hitting them better and cooling them somewhat Shadeslay is alot like me I like to make stuff too :~)
    Just to say, whit your advice my babies are looking much better and it's only 24 hrs. I am not going to flood you with pic's but in 5 days I will show you what has happened.
    Blessings to all

    cflking33 Member

    quick question were the very point of your leaves burnt basically the very tips of the jagged part of your leaves? if so i think you may have just solved my problem mine are looking just like that

    bobvincent Member

    I had same problem lately and now my problem is gone i just buy a urea and apply 3 pellets in the soil let the urea dissolve for about an hour and water it dude and see what happen.
    420 Organics

    420 Organics Member

    Yo Jeff,

    Greetings man! Where are the pics and how have the ladies been?

    I live on the Napa/Lake County Line in CA and we have great weather and a lot of outdoor and greenhouse growers. One of my friends was also curious why his leaves began to curl up. He does a very organic and home made tea so it's not hot in the NPK's. He asked me why it curled up and my first thought was because they were Sativa Strains (I've had quite a few in the past that did that a little). Anyways, he had Indica plants doing it as well in his greenhouse grow. He keeps them appropriately watered, never too much... if anything too little to strengthen them from time to time. Bottom line, wanted to say thanks so much for this post and it's been a great help. I will tell my friend it's mostly due to the heat we get.

    Thanks Again & Be Well!

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