Guide for Diagnosing Plant Problems

Jack Kilgore

Jack Kilgore

Well-Known Member
Roger A. Shrubber said:
more than likely. there are other possibilities, but N is by far the most likely culprit
also could be a little too much wind, got a fan hitting this plant straight on?
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Ok, no fans outside but its been real windy last few days. Im seeing them come back to normal now, its been about 4 days and theyre next feeding is supposed to be today.

Ive been giving them about 4.5g of MEGAcrop along with 1 g of PK Booster. I spoke with MEGAcrop and a rep told me the tips curling come from N build up at the cell wall inside the Chlorophyll, which turns them tinted blue verrrry verrrry subtly. I checked and he was dead on. In the right light and angle, you could clearly see the edge of leaves were just like a car windshield, with that little tint of blue at the end. It was fascinating to figure out.

Thx for the guidance.
 
bluedream2

bluedream2

New Member
Just put in vegg couple days ago, gonna go water here soon. Just transplanted to final medium today as well. Total rookie also lol. Thought I seen some sign of nitrogen defiency so I put a little bit of blood meal on em 3 to 4 days ago. I also feel like maybe my pH in soil may be off?? By comeparing ti other pics. Thanks in advance
 

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_GoOnIeSNeVeRsAyDiE

_GoOnIeSNeVeRsAyDiE

New Member
My first plant, it has been 3 weeks so far and I need some insight. I’m using a LED and have a fan running. I bought vigoro potting soil + fert. I have come to the understanding buying soil with fert. Is a no go for seedlings. So after research, I attempted to do a ph check on soil. not sure if reading is correct. But my soil reading was to alkaline ( home remedies ) 2 tspn of vinegar/ 1 gal of purified water. So far is looks as tho the plants is still growing but dying all the same { My baby has Benjamin button disease} I need help.
 

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Roger A. Shrubber

Roger A. Shrubber

Well-Known Member
if you've already flushed it, let it dry out pretty good, then water it with plain water the first couple of times you water it. let it dry out good between each watering, till it starts to grow vigorously. actually, always let it dry out good between waterings, just really needs it now.
the nutes in the plants coty leaves, plus whatever is still in the soil, ought to carry it for a couple of weeks, probably. when you do start feeding it, start around 150 ppm, and work up from there, read the instructions, then cut the amounts at least in half .
don't worry about the ph of your soil. just ph your water going in. as long as you put it in at the right range, it'll be fine. the soil will change the ph, and the plant taking what it needs will change it further. that's natural, and it changes as it needs to change, so don't try to control it, just put it in right.
 
_GoOnIeSNeVeRsAyDiE

_GoOnIeSNeVeRsAyDiE

New Member
Roger A. Shrubber said:
if you've already flushed it, let it dry out pretty good, then water it with plain water the first couple of times you water it. let it dry out good between each watering, till it starts to grow vigorously. actually, always let it dry out good between waterings, just really needs it now.
the nutes in the plants coty leaves, plus whatever is still in the soil, ought to carry it for a couple of weeks, probably. when you do start feeding it, start around 150 ppm, and work up from there, read the instructions, then cut the amounts at least in half .
don't worry about the ph of your soil. just ph your water going in. as long as you put it in at the right range, it'll be fine. the soil will change the ph, and the plant taking what it needs will change it further. that's natural, and it changes as it needs to change, so don't try to control it, just put it in right.
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I’ve added a lil more on what I have going on in the environment. But do you think it’s a nitrogen deficiency ? I have a photo of the seedling below
 
T

Tsilo

Member
IMG_20181030_215059992.jpg IMG_20181030_215107663.jpg IMG_20181030_215221245.jpg IMG_20181030_215312950.jpg
ultra white amnezia from minitstryofcannabis.
plant is 3-4weeks old and leave stems are purple and in first week or so first two bottom leaves yellowed and fell off (maybe overwatering). also leaves are stiff but small tips are upwords and have bit brown, looks like nutrient burn but I gave very small amount of nutrient and only once. also temperature falls down to 18C (lights out) maybe stems are purple cos of this or it's genetics no idea. anyways I think it's growing really slow and afraid it has some kind of problem but no idea what any suggestions? or am i just panicking :D btw it;s under 30w led bulb
 
Roger A. Shrubber

Roger A. Shrubber

Well-Known Member
Tsilo said:
View attachment 4224467 View attachment 4224468 View attachment 4224469 View attachment 4224470
ultra white amnezia from minitstryofcannabis.
plant is 3-4weeks old and leave stems are purple and in first week or so first two bottom leaves yellowed and fell off (maybe overwatering). also leaves are stiff but small tips are upwords and have bit brown, looks like nutrient burn but I gave very small amount of nutrient and only once. also temperature falls down to 18C (lights out) maybe stems are purple cos of this or it's genetics no idea. anyways I think it's growing really slow and afraid it has some kind of problem but no idea what any suggestions? or am i just panicking :D btw it;s under 30w led bulb
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what medium are you growing in? it doesn't look like coco coir, so...
they are over watered, and that can cause problems with nutrient uptake. let them dry out more between feedings, and they'll be able to absorb the whole range of nutrients a lot better
 
T

Tsilo

Member
medium is for flowers I dont have access to coco locally so I use what i have to :D
but plant is getting worse no idea why I reduced watering and let sodium dry really well. I dont give nutrients yet my onlu consern is that temperature goes down to 18C. other than that I don't know what may be problem.
new leave also have purplish color to it. is it genetics or what?
HELP!
 

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Roger A. Shrubber

Roger A. Shrubber

Well-Known Member
that is text book over watering images...."turgid" leaves, that curl downwards, with stems that do not droop......repot them into bigger pots, add a LOT of perlite to that soil....start feeding them, about half what the directions say to begin with, work up slowly from there......
water once, till you get a little run off out of the bottom of the pot. it doesn't have to be a lot, just enough that you know some of the old nutrient salts have been washed out. then do not water again till you can stick your index finger into the soil to the second knuckle and it feels ABSOLUTELY dry....not even a little damp...you actually need to learn to feel the weight of the pots. let them get dry enough that the plants are just about to start wilting, then feel how light the pot is. you want them to get pretty close to that dry before you water them each time. especially in soil, otherwise your roots will just rot the hell off
 
Rolls4dayz

Rolls4dayz

Member
Hey - just wanted to check what this might be? Potassium or Phosporus deficiency?
Capture5.PNG


Also i'm pretty sure this is spider mite, i've googled the F outta this and so far it seems spraying the mites off with cold water before lights out, then using an insecticidal soap and potentially introducing predatory mites.
Does anyone in Australia know where you can obtain such mites not from the internet?
Capture4.PNG Capture3.PNG

Thanks in advance
 
ILGM Will

ILGM Will

Member
Jack Kilgore said:
Wanted to know if this is N toxicity beginning. No other symptoms, just the Claw? Anyone?
View attachment 4175742
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Solving Marijuana Plan Leaf Curl/Cupping Problems

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.
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.
  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.
  5. 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.
 
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