help! leaf tips like claws down and around?

caveman2k11

caveman2k11

Member
got a problem with a potassium def. and also maybe a nitrogen tox as the leaf tips are like claws that is understanable as with the potassium prob i thought it could of being nitrogen def. but it turns out its potassium as the tips and leaf edges are brown and is spreading from bottom to top of the plant now also the the leafs are going a lighter green inbetween the leaf vains any help on this matter would be great as i dont no if its under feeding potassium or over feeding..
 
zzwasted

zzwasted

New Member
there typical signs of cal mag def , the bronze edges are typical calcium def signs and the lighter green foliage are typical signs of mg def
 
Flaming Pie

Flaming Pie

Well-Known Member
Don't listen to zzwasted. It IS NOT calmag.

Does look like potassium to me. Were the leaves clawing before the edges started fading? Might be overnuting is blocking out the potassium.

Good luck to you.
 
Dwezelitsame

Dwezelitsame

Well-Known Member
Here are some common problems when marijuana leaves are curling.

  1. 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 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. 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 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. 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.
  4. 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
 
Hugo Phurst

Hugo Phurst

Well-Known Member
I know fuck all about soil, but that looks like multiple problems. The purple could be a phosphorus def, along with the cal/mag (brown edges), and the tips look like over fert.

Check the Ph, give her a good flush, and feed her week nutes till she perks up - but that's just what I've read.

Good luck
 
caveman2k11

caveman2k11

Member
the clawing was last of all, the first was leafs fading then brown edges the clawing i was advised a good flush and water for a week to two weeks maybe. was this good advice?
 
Dwezelitsame

Dwezelitsame

Well-Known Member
purple vains in leafs hugh



peep dis out
[video=youtube;BOwpB3J8lis]http://www.youtube.com/watch?feature=player_embedded&v=BOwpB3J8lis[/video]
 
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