Symptom Checker – Identify Marijuana Plant Problems

This cannabis leaf symptom checker will help you to quickly identify marijuana plant problems and easily diagnose sick marijuana plants!

Learn more about common cannabis leaf problems, nutrients, diseases, stresses, pests, and bugs. Click on any picture for detailed information about a particular marijuana problem, deficiency or symptom and find out what’s wrong with your plant.

Nutrient Problems

boron deficiencies in cannabis plants

Boron deficiency

copper deficiencies in cannabis plants

Copper deficiency

calcium deficiencies in cannabis plants

Calcium deficiency

iron deficiencies in cannabis plants

Iron deficiency

magnesium deficiencies in cannabis plants

Magnesium deficiency

manganese deficiencies in cannabis plants

Manganese deficiency

molybdenum deficiencies in cannabis plants

Molybdenum deficiency

nitrogen deficiencies in cannabis plants

Nitrogen deficiency

phosphorus deficiencies in cannabis plants

Phosphorus deficiency

potassium deficiencies in cannabis plants

Potassium deficiency

sulfur deficiencies in cannabis plants

Sulfur deficiency

zinc deficiencies in cannabis plants

Zinc deficiency

pH fluctuations in cannabis

pH Fluctuations

nutrient burn in cannabis

Nutrient burn

Cannabis Nutrient Deficiency Chart

Major and Minor ElementsExcessDeficiency
Nitrogen Deficiency
Nitrogen Deficiency
Yellowing of leaves is traveling upward fastPale Color Leaves
Yellow Leaves
Yellowing Between Veins
Old Leaves Falling Off
Withering / Sagging Leaves
Phosphorus Deficiency
Darkening (dark green, blue, or gray) of the lower, older leaves
Thickening and spot forming (bronze, purple, or brown in color) on lower leaves
Mottled or mosaic-patterned leaves
Yellowing of leaves
Twisting and curling of leaves
Burning and dying of leaf tips
Old leaves falling off
Stem discoloration (red or purple)
Twisted or stunted new growths
Root rot
Potassium Deficiency
Potassium Deficiency
Brown or burnt leaf edges
Dark, brown spots
Stretching – characterized by large spaces between nodes
Plant is too tall
Pale colored leaves
Yellowing of the lower, older leaves
Death of leaf tips
Spots on leaves
Older leaves falling off
Slowed growth
Curling leaves (under or upward)
Buds not getting fatter
Boron Deficiency
Purple or darkened leaf color
Dark brown spots on leaves
Thicker growth tips
Browning or burnt leaf edges
Slowed growth
Twisted or abnormal plant growth
Copper Deficiency
Darkened, twisted leaves
Undertones of blue and/or purple
Metallic glinting
Leaves curling under
Tips turning yellow or white
Lack of ripening in the buds
female pistils are not growing regularly
Limp, wilting plant and/or leaves
Weakened stems
Calcium Deficiency
Leaves’ green color darkening
Large, light brown necrotic spots
Tips of leaves curling
Leaves are dying off
Stunted growth
Young shoots are discolored – purple or yellow
Stems and branches are weak
Roots may begin dying off or turning brown
Iron Deficiency
Iron Deficiency
Signs of deficiencies in other nutrients such as manganese, phosphorous, zinc, calcium, or copperYoung leaves turn pale yellow 
Minimal bud sites
Magnesium Deficiency
Petioles and stems become purple in color
Light brown spotting on the edges
Development of red stems
Yellowing and weakening of the lowest leaves
Leaves start turning inward and soon die
Growing shoots will start going from pale green to white
Manganese Deficiency
Manganese deficiency in marijuana plants
Speckling / Patchy Pattern
Top Leaves / Newer Growth Damaged
Pale Color Leaves
New Leaves Turning Yellow
Yellowing Between Veins
Slow Growth

Molybdenum Deficiency
Mottled, spotted leaves
Abnormal coloring that starts at the leaf’s center
Older leaves located towards the base start to yellow
Discoloration of leaf edges: orange, red, or pink in color around edges
Sulfur Deficiency
Upper leaves and newer growth damaged
Pale color leaves
Yellow leaves on lower leaves
Yellowing between veins
Limited plant growth
Buds not thickening
Zinc Deficiency
Speckled / Patchy Pattern
Non-vertical Growth
Yellow Leaves On New Growth and veins
Leaf Tips Appear Burnt
Leaves Curl Under

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algae on cannabis


bud rot on cannabis

Bud rot

leaf septoria on cannabis

Leaf septoria

powdery mildew on cannabis plants

Powdery mildew

fusarium on cannabis


verticillium wilt on cannabis

Verticillium wilt

root rot on cannabis

Root rot

damping off on cannabis

Damping off

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ants on cannabis plants


aphids on cannabis plants


caterpillars on cannabis plants


cutworms on cannabis plants


crickets and grasshoppers on cannabis plants

Crickets and grasshoppers

birds on cannabis plants


cats and dogs on cannabis plants

Cats and dogs

deer on cannabis plants


gophers and moles on canabis plants

Gophers and moles

rats and mice on cannabis plants

Rats and mice

fungus gnats on cannabis plants

Fungus gnats

leaf miners on cannabis

Leaf miners

snails and slugs on cannabis plants

Snails and slugs

spider mites on cannabis plants

Spider mites

whiteflies on cannabis plants


thrips on cannabis plants



cannabis heath stress

Heat stress

humidity and temperature in your cannabis grow room

Humidity and temperature

pruning marijuana plants

Pruning cannabis

airy and loose marijuana buds

Airy and loose buds

marijuana clones won’t root

Clones won’t root

stretching marijuana plants

Stretching plants

hermaphrodite marijuana plants


cannabis seeds won’t germinate

Seeds won’t germinate

dark cycle interruptions cannabis plants

Plants won’t Flower

marijuana plant knocked down

Knocked down plant

hard or soft water for cannabis plants

Hard or soft water

cannabis and weather


overwatering and underwatering marijuana plants

Over- and underwatering

marijuana soil problems

Soil problems

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Robert Bergman

Robert Bergman is an Amsterdam-based marijuana grow expert who has years of experience from small grows to massive operations. His passion for growing lead him to develop his own Gold Leaf strain. Now, Robert is dedicated to sharing his knowledge with the world.... [Read full bio]


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    114 comments on “Symptom Checker – Identify Marijuana Plant Problems”

    Leave a Comment

    1. Hi.My seedlings have brite yellow spots on them.I did not see any like this in your examples.Can you please tell me what you think I might be going on?Thank you very much.

      • I had to transplant after it got knocked down and now it growing unhealthy and im dont know what to do. Its my first plant and its been in the veggie stage since August. Its an indoor plant. I would keep it in my back room but its cold and my timing of planting was way off……. I think. My plant needs help

    2. This article works equally well for my tomatoes and other veggies! Used it during my winter grow to prevent infestation in my ladies, my WW and AK-47 came out good! Considering the trials and tribulations I put them through, your seeds produced plants that managed an exceptional harvest. Thanks Robert for all you and your staff do for us growers!

    3. Rich. Best way for you to get answers is to join the forum, and fill out a support ticket, copy/paste that into your own support topic, and add a couple pivtures. We will be glad to look in and advise you. 🙂

    4. Lee and Jo, I advise you all to download and read our free grow bible. Nutrinet burn is when the solution or soil mix is too hot fore the roots, and burns the plant down.

    5. You should always flush your plants if you are sure it is Nutrient toxidity, (nute nurn). I advise you all to join the support forum. This will get you faster response to your questions; Especially in an emergency!

      In order to not cause a “toxic” event in your grow; Make sure to supply yourself with the proper PH, and EC/TDS meters in order to control the grow environment of you plant.

    6. Such an in depth look at the problems plants can get! This is a great guide for people starting out growing their own. Thanks for sharing!

    7. My one month old plant suddenly has white dots on the leaves, I’ve recently added Epsom salt to my bubbleponics, because of magnesium diffeciency

      • White dots generally indicate spider mites or aphids; Or; If you spray the plants with water…This can cause spots. We always invite growers to join our support forum for a more in depth support system

    8. Love the article, is the main top picture of a grow room in bloom considered normal? I see several yellow/brown curling fan leaves.

    9. i am on my first grow mw babys are 11 days old and the leaves on a couple of them are getting leaf curl and look a litte deformed im using hps 1000 mh bulbs that are aprox 18 -20 inches over plants and they are set on the lowest setting im watering once to twice a day in coco and perlite vermiculite at 25 p 25 v and 50 coco im using gh flora grow and gh micro at 1/4 tsp per gallon so can anyone tellme if im over nuting or over watering tips very end of tips are turning brown on a few leaves but not all oh they are bag seeds so may not all be the same they seem very heaalthy other than the few leaves that are deforming tuning round at ends and they have a grey look on the undersides ive dedicated a lot into my grow room hoping now that its legal in oregon to become a grower for some of the shops that will soon be around any help or suggestions would be greatly appreciated thnx everyone MOWERMAN

      • i asked about my plants so i can learn about some of the problems and learn to fix them before i put my very expensive seeds in the pots so ive got everything as close as i can ahead of time oh ill be growing serious six and lsd when i feel good enough at this to start them but first i need help figuring out the little nuances of indoor growing im doing 10 starts and have room for 10 plants in my flower room not doing sog so 10 is all that will fit comforably5 ft x10 ft with 8 ft ceilling

      • mowerman,

        2 immediate serious issues come to mind.
        1. 1000 watt lamps are too powerful for seedlings. They can be used by expert growers at a safe distance. 32-36″. Maybe higher for seedlings. Temps, and humidity play a factor.
        2. Never apply nutrients to a seedlings. There must be 4-5 alternating nodes; Or, 4-5 trues sets of leaves; Proof of an established root zone.

        I question your idea to use Flora grow, and Micro alone. I have never seen this, and I used GH flora 3-part for 5 years. In early stages of development, plants develop stronger root zones with the application of potassium. So; Bloom would be better than Grow and Micro…

        Feel free to join our support forum for more in depth grow info. 🙂

    10. Hello to all growers and future growers,
      just one comment and one question:
      The price for your seeds is NOT as important as customer satisfaction and support from a company that stands by there product and guarantees your shipment like these folks do !!
      look around at the competitors guarantee and you will see what i am talking about. my first order got snagged by the authorities. these guys re-shipped asap with no question. i was so impressed that i don’t even bother looking elsewhere ! do your self a favor and spent a few extra bucks and get the feminized seeds and no worries about male plants. even if you only got ONE OUNCE from a plant…that alone would be about a $300.00 value right there and you better get more than that or go back and read growing for Dummies…LOL. every seed i use has germinated so far without any problem.
      I have just one question to ask please. i live in an RV and had enough room for one 2×4 grow tent. i would like to be able to have some vegging while others are flowering. cant do that in the same tent obviously.
      can i veg my plants outside of the tent in normal day and night lighting as long as i provide the plants with high intensity 24 hours a day lighting closely above the plants and then move them into the 12 12 flowering tent when i harvest the ones that were in the tent ? secrecy is not an issue for me where i live and not afraid to have plants vegging outside of the flowering tent.
      PLEASE…i need the answer from a reliable source before i do something stupid and wasteful.
      Thanks in advance for any advice that you might have and good luck to you other new guys like me.
      Thanks again…Vern

    11. No. Sorry brother, but you cannot flower and veg in the same room. I also believe I answered this question on another page.

      You never want to keep plants awake for 24 hours. 16018 hours of light is best for vegetative cycle, and 12/12 for bloom. Plants need rest just like human beings. Want proof. Read the ingredients on your multi-vitamins. Now; Read the ingredients on your high quality nutrients. You will find them surprisingly similar. 🙂

    12. you have this huge picture for the link and at the top of the page showing all these problems with answers except for the one that is at the top!!!!!
      Im super interested in what caused that!!!!!!

    13. […] Symptoms of underwatering include wilting, improper growth, and a lack of moisture in the soil. Although it happens less often than overwatering, it is still a serious problem that could negatively impact your seedling. It happens especially with beginners who have been warned – ‘never overwater your plants,’ so they overcompensate in the opposite direction. […]

    14. Albert420

      Looks like your nutrients or fertilizer is too hot. This can also be caused by PH being off. I suggest you join our Support Forum, and fill out a “Support Ticket”.

    15. Hey everyone. Awesome symptom checker btw. Unfortunately I cant find anywhere what is wrong w my plant. I have 2 Northern light trees, same everything, simple potting soil and no food added yet. So one of them suddenly has black coloration in the center of the growing flowers and slightly purple leaf stems. Hope someone has seen this before. Thank you and have a great day.

    16. panos,

      I advise you to join our support forum. We have many knowledgeable members and experts always willing to help. 🙂

    17. I have 4 week old plants of various types growing indoors under a solar storm 440. They sprouted fine, grew to about one inch and a half and then quit growing. They are still alive putting on new leaves but they haven’t grown any taller and the leaves are tiny. I’m thinking that it might be bad genetics. I need some help.

    18. Please help me out..
      I had grown 13 plants in a space of nearly 200 cm2 by planting them in last week of August where they were good and GREEN. Till September 20 they were flourishing well but one day suddenly 2 plants were like dying after being 40cms tall. I got panicked and went to see ..when I slowly pulled they easily came out..
      My god I saw the stem and the skin was detached from the main root by some insects who ate it inside the soil…
      It thought a while and applied some neem leaves crushed water with salt for hopeful result. obserbed but same happened again.plants are sloely dying.. From 13 now 6 plants only survive presently. I am so desperate. Please help me out.
      I would like to send the video and pic of the can I do that.. I am in South India in AP where red sandy soil exists and the tclimate now is humid rainy and Lil sunshine..
      Please someone respond asap..
      With best wishes

      • Sounds like it could be fungus gnat larvae. I had 3 of 7 ww die because of these little bastards. The larvae eat fungus and other like material in the pot and when all gone, they start to work on the roots. Stop wasting. Let the soil dry completely( May take a week or more) and sprinkle a later of salt free sand on top of your soil. This creates a barrier that the larvae cannot escape from. Trapped and with nothing left to eat,they will die. Good luck. Don’t use bonide. Unless you wanna taste it with every hit.

    19. Niraj,

      You can join our forum at www;

      Here after making some posts and a little reading time you can post images of your grow. I am sorry to hear about this serious issue but, we can help you out for the future.

      damp and little sunshine is not a good climate for cannabis plants. There are so many reasons this could be happening.

      I look forward to seeing you at the forum. Just post @latewood to let me know you are in the community. I will try to help from there.

      • HUe Bud,

        It is very hard to identify leaf issues without a picture. I usffect you study the pictures in this article and determine what issue you have.

        Another option is to join our support forum, and we can help you out aftyer you post a couple pictures. 🙂

    20. hey my plants are like 4 weeks into flower and about 3 weeks ago i transplanted from pot to ground and on the 4th week they are starting to yellow any help tips on what the problem could be

      • rip,

        Again; It is hard to say without pictures. Repotting and replanting outdoors after you start the flower period is not recommended. Thewy could be getting too wet, or not have enough nutrients available to them.

        Best if you join our support community and tell us exactly what you have done. Too many variables in your case to give you an informed answer. Sorry 🙂

        When you join ILGM, fill out a support ticket

    21. hi! one question..!i saw some brown lines on some leaves one have a little very small hole make….as i see maybe its a magnesium deficieny just sprayed with calcium/magniseum/natrum solution.last feding was a bit light because i think i overfed her last time?plant is only 22 days with light cycle 18/6 with the 8 hours per day out to the sun and artificial 50w cfl for a bit while longer and then going out for the rest of her life.all these changes you think shocked her and need magnesium for fotosynthesis as see is young until now thats why can be magnesium? thank you very much!!!

    22. How you ever come across lack of dankness? Grew 4 different strains together from 3 different seed breeders. All 4 had very little smell if any. Literally zero dank, just a very mild citrus in 1 and a mild vanilla(ish) in another. Other 2 just smelled of a generic garden plant (not 420). 3 of the 4 smoked fine, just no taste/smell. Couldn’t be just bad luck with all of them, could it?

    23. Hi , hello , my plants all have yellowy browny big leaves. Can I send you a photo of them ?
      They are autos growing outside in Southern Hemisphere

    24. I consiider myself a pretty good grower, but just ran into an interesting situation. I planted 7 Purple skunk seeds, 6 of them came up. However, one sprouted 2 plants from 1 seed, almost like siamese twins. Ever seen this?

    25. My plants look beautiful but the leaves are really small. I’m in 3rd week of flower and the heads are there and the are looking like normal but the leaves are really small

    26. Hi, ive been growing weed outside for about a month now and everything has been fine up until now. I see darkening on The edges of the leaves and tiny orange spots and Throughout. Please email me back so i can send you a Picture .

    27. My 15 seeds didn’t Hatch and I put my Faith by sending you 159.00 that I was getting quality seeds because I love growing Marijuana too I wake up to sit next to my little green dudes now it’s like don’t even want to get out of bed so all I got is the Guarantee that read about in the beginning

    28. Started noticing small brown spots on a number of leaves on my plants. Just the spots, no yellowing. What’s going on?

    29. Please I need help. I’m on Week 7 Flowering and I’m fighting this brown mold on lower part of stem. Haven’t went to find anything for it. I’ve been blasting fan on it and a 100 watts seperate light with 150 little led lights.

    30. So…. I had 2 plants I put then outside and my dog got ahold of the pots and ran around with them I thought they were dead but I found one of them looking pretty ok… suffering bug bites small leafs at the bottom big leafs at the top I’m wondering what should I do to help it get back to a healthy state ???

    31. Help! One plant started forming buds, the buds seemed to open up and blow white powder everywhere. What did I do wrong?

    32. Steve,

      You need to join our forum where we can address you issue and share info.

    33. ESTin76,

      Please go here where you can establish an account and we can help you with your issues. We are not set up to do grow support here in the blog. Thanks 🙂

    34. Marc, Not sure what you mean… go here: and you might be able to search for info, or have members abd staff help you out.

    35. Brad and John, You both should go here, establish an account and allow our staff and members to help you. Peace, lw

    36. I’m growing a single Grandpa Larry plant , 17 days into flowering the small leaves on the flowers starting to form on the upper shoots are beginning to curl like a claw not the large Sun leaves.. I flushed the pot 17 days ago with straight water. This also happened on the last plant I grew of Grandpa Larry. PH is 6 2 and ppm’s right now are 750

    37. I have a week old seedling and it has One leaf that’s smaller than the rest is this normal or is ther Something I’m doing wrong

    38. I went and checked out this grow and when I was looking at the plants There was this crusty looking stuff on most of the stims and I was wounding what that was if anyone can help me

      • To: David, Wilson, Alan, Bobby, and John. All of your quaesitons are ofr Q and A and the blog is meant fgor comments on articles, not Q and A. I suggest you all go here:, join the forum and post your questions there in an appropriate category. Happy growing 🙂

      • PLANT 6 weeks, starting female..look good then main stem start to turn brown. Leaves margin burnt look…brown goes to other branches

    39. PLANT 6 weeks, starting female..look good then main stem start to turn brown. Leaves margin burnt look…brown goes to other branches

    40. My dog ate bunch of leaves when my plant started flowering. It’s in the 4th week and the buds arent getting any bigger anymore. Feel like they stopped growing…

    41. Yes I have a couple of plants that or in flowering stage and I really don’t know age and would really like someone to take a look at a couple of pictures and try and tell me the age and maybe around how much harvest might be?

    42. Somebody help I had 30 plants that were doing really really really well and then three days ago I put them into the ground and now they’re dying one by one they look burnt up but I did not put any fertilizer on them help what do I do do I take them out of the ground I can’t seem to find the answers on the Internet because I did not fertilize my plants they were doing wonderful until I put them into the ground I need to know if I need to dig them up as soon as possible please somebody help me ASAP I’m down to nine plants

    43. Hi I have noticed sence early stages of my plants life look to be some sort of salt build up nts…ph is at 6.2 all other plants seem to be fine but I’m worried it’s a fungus of some kind day time temp is 77f and the is 45% night time temp is around 70 f and the 45% any suggestions would be a big help

    44. I started some afghan outdoor feminized seeds March 30, 2020. They started flowering & then budding several weeks ago. Now it seems they are revegging. It has been very hot in Texas. I do not feel its time to harvest but I thought a couple of weeks ago it was? Now I am confused on what to do. The buds do not look like all the photos I have seen of plants ready to harvest. The plants are in a huge pot on my patio. I have used fertilizer at given staged…help!

    45. The photo of the late stage flowering plants with crispy yellow leaves at the top of this page.. What is that? I’ve had that before

    46. I can not figure out what is going on with my plants. Every 6 to 9 weeks they keep going through a faze where they seam to act like they either have tobacco mosaic virus. Or seemed like they might have broad mites. Hi don’t seem find the mites. Any suggestions on what it might be. Anyting will help at this point.

    47. i just discoverd thrips on my plant i am in week 8 flower. bugs are not thick yet is their a fix for this without cutting the plant down its a jack Herer

    48. I’m growing outdoors in Hawaii. Sometimes just before harvest I come out to find a whole branch has ‘crashed’ literally overnight. Bud goes from green to brown and leaves wilt. Can you offer an idea of what’s up? Thanks so much. It is heartbreaking to see a beautiful plant develop and then slowly go down a branch at a time.

      • I’m not an expert, otherwise i wouldn’t be here reading up on plant problems, but i have dealt with something very much like what you have described. It happens very quickly, the leaves in the effected buds brown and die off and the bud looks brownish. If this is what’s happrning to you, it sounds like “bud rot.” At least that’s what has happened to me before and it’s devastating! It happens so quickly and the only thing to do is cut off that branch and hope it hasn’t spread to other buds on other branches.

    49. What is the issue with the plants in the very first picture? (The picture of numerous plants, with mostly dead, curling leaves) That looks very similar to what has happened to me before. I assumed i over-fed them, but i don’t know.

    50. I have more of a question than a comment. I planted 2 Gorilla Glue 3 weeks ago. I put them on a 18 hour cycle 600 watt HPS light. The are doing fine except 1 is about 8 inches tall with 7 flowers and the other 5 inches and has 3 flowers is this normal for GG an should I change the light and put them on a 8 hour cycle. I have always grown white widow with no problem

    51. I have a Hindu Kush CLONEI would really like to send pics and to see if someone might be able to help me identify my problem and help me solve it to save it

    52. My plants got bugs not shown. They look like a black tick when mature, scraping off of branch looks like blood and tiny legs, they seem to form from within the plant and come out to the surface begin as a small tan round bump . what are they and other than scraping them off what can I do to kill them “organically”

    53. HI, My plant is 4 months old it’s a white widow auto flower. I expected buds in February. still nothing. I do have some pistils but no action on budding. I do feed the soil and been using Bergman’s initial protocol fertilizers. But the feeding chart time has run out weeks ago! Any ideas out there?

    54. hi i just grew my 1st plant white widow and didnt get much from it but only just got a decent light so just popped another seed and its got 3 leaves will it be ok ? also it took 4 months it was an auto it never even flowered till gone 10 weeks my understanding was it took 10 weeks to harvest not flowering any advice

    55. I received my seeds followed all instructions from a pot4pot my seeds are up and at day 6 in seedling phase I’ve been using a spray bottle with demineralised water twice daily soil is damp not wet plant 1 is doing fine however plant 2 ive found that the 1st set of true leaves are turning up and appears to be burning? On the tips. Can anyone tell how to help this lady survive she’s a banana kush she’s 6days old and answers to the name daisy and daddy’s worried about her

    56. I cant get any seeds to sprout. This is my 3rd grow and I’ve never had a problem getting seedlings with the paper towel and saucer method. This year neither purchased nor bag seeds will grow a tail. what could keep seeds from sprouting?

    57. I have a weird one one. My plants aren’t normal. There is only one leaf on the new growth instead of the normal 5 leaves. My plants are defective or what? I am ready to give them up. Anyone seen anything similar?

    58. My leaves are showing signs of one side of the leaf with what looks like a burn. It is moving up the leaves on the plant. Is there a site where I can send a picture of the leaf and receive an opinion of what it might be.

    59. Cant find symptom. Yellow edges on leafs. Starts to change to all yellow. Stunted growth. No pests. Fed only water. Do u know wat this is??

    60. My plants have been in flowering stage but I have noticed the leaf tips have turned yellow and some are even dry and crumble when touching. I have just one out of the five have yellow freckles on the leaves, but only on parts of the plant ,not on all leaves ! I have raised the LEDs light away thinking it was light burn but its been a few weeks now and there’s no change .Can someone please help. Also mostly all the leaves are curling down

    61. my leaves are yellowing and some are red in the center,i ordered ph detectors but they havent come yet,but they are budding well,last stain was afganistan /hanging/this one is bannana kush.6 hrs night,6 hrs day….its has to be ph balance ,right?

    62. hi Im new to growing out doors im growing (moby dick and tropical berry) in mother earth ground swell using general hydroponics nutes. I have 14 plants in a mix of 3 gallon and 5 gallon fabric pots. my leaves are curling and clawing from the outside in and becoming brittle., Ive added Armor si Silicone to my nutrient regimen. every other day they get Floranova grow, cal mg armor si. The outside temp has been over 100 degrees alot. 9 plants are not affected the five that are exhibiting symptoms are the same strain I can tell that. I have wheeled them all into the shade it didnt change anything the five plants started having this issue at the same time. I didnt have any problems with these plants until a weeks ago