Leaves curling up and looking dry

[zeuss]

Indoor/Outdoor: Indoor

Growing Medium: Good quality potting mix

Growing Style: freestyle

Watering/Feeding Frequency: as needed 2 - 3 days

Nutrient Strength (PPM/EC): n/a

PH Levels: 5.8 - 6.2

Temperature/Humidity Levels: 25c / 50%

Air Flow/Fans etc.: good airflow w carbon filter

Lighting Type (CFL/HPS/MH etc.): 400w HPS

Total Wattage: 400w

Growth Stage: 12/12, 30 days ago

Plants Age: 8 weeks

Cannabis Strain: not sure, prob sativa indica cross / bag seed

 

I have 3 plants in a 1.2m / 1.2m tent with 400w HPS, two of the plants are very healthy, tight and bushy, the problem child is a bit straggly and a bit taller than the other two. they have had the same watering and nutrients. they are about 30 days into 12/12 and are being fed Canna Flora and Cannazyme around every three days or as needed going by weight of pots, not sure on size of pots, probably 20 litres or so?

Can't figure out why the problem plants leaves are curling down and looking dry? it seems to be budding up nicely but a bit scrawny..

I will add a couple of pics, the first two are the problem and the third pic is of the one right next to it, both have exactly the same watering / feeding schedule, i will be starting them on Cannaboost and PK13/14 in the next week or so..

Any help would be very much appreciated..

Cheers

Z

[Haratio Hornblower]

Looks like nute burn imo

flush

flush

flush

 

zyme in potting mix?????

Edited June 13, 2012 by Haratio Hornblower

[Ford Fairlane]

Hi zuess, I had a similar problem recently, I found this document that another member put me on to quite helpfull good luck with it.

Puka

 

"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"

[Budzzz]

Top post pukka.

 

Notice how 1 and 4 often go hand in hand. I have had plants do that to me before in potting mix, it turned out that I was over watering my plants. I could understand it because my healthy ones were in the same mix and getting the same amount of water/nutes. Indoor soil grows are harder than people think.

[zeuss]

Looks like nute burn imo

flush

flush

flush

zyme in potting mix?????

 

Hmmm Could be right there i think after reading the doc that Puka kindly took the time to post for me.. Odd that the other two are looking so well and have been recieving exactly the same nutes and watering schedule..

Apparently the cannazyme is suitable for all mediums according to the label on the bottle?

 

Hi zuess, I had a similar problem recently, I found this document that another member put me on to quite helpfull good luck with it.

Puka

Thankyou mate, much appreciated. the only thing i think it could be is too much nutrients, thought i was being very carefull to follow the directions, i'll flush them all i think and give the nutes a break for a week or so, i wonder weather the fact that the potting mix has slow release ferts in it from the shop, maybe that plus what i have been feeding it has od'd the poor gal?

 

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.

 

The plant with the problems will be pretty difficult to remove from the tent at the moment as it is tied back to the poles all over the place, i think i will put a bucket under it and pour another bucket of fresh water through it to give her a good bath, hopefully that might solve the problem.

I will get back to you with the results..

Thanks for the help guys...

Cheers

Z

[forgetiwashere]

here is a link to a site i find very simple to use and has been very helpfull to me.

 

http://growweedeasy.com/marijuana-symptoms-pictures