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Symptom Checker - Identify Marijuana Plant Problems

Symptom Checker - Identify Marijuana Plant Problems

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

Learn more about 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.


boron deficiencies in cannabis plantsBoron deficiency

copper deficiencies in cannabis plantsCopper deficiency

calcium deficiencies in cannabis plantsCalcium deficiency

iron deficiencies in cannabis plantsIron deficiency

magnesium deficiencies in cannabis plantsMagnesium deficiency

manganese deficiencies in cannabis plantsManganese deficiency

molybdenum deficiencies in cannabis plantsMolybdenum deficiency

nitrogen deficiencies in cannabis plantsNitrogen deficiency

phosphorus deficiencies in cannabis plantsPhosphorus deficiency

potassium deficiencies in cannabis plantsPotassium deficiency

sulfur deficiencies in cannabis plantsSulfur deficiency

zinc deficiencies in cannabis plantsZinc deficiency

pH fluctuations in cannabispH Fluctuations

nutrient burn in cannabisNutrient burn

algae on cannabisAlgae

bud rot on cannabisBud rot

leaf septoria on cannabisLeaf septoria

powdery mildew on cannabis plantsPowdery mildew

fusarium on cannabisFusarium

verticillium wilt on cannabisVerticillium wilt

root rot on cannabisRoot rot

damping off on cannabisDamping off

ants on cannabis plantsAnts

aphids on cannabis plantsAphids

caterpillars on cannabis plantsCaterpillars

cutworms on cannabis plantsCutworms

crickets and grasshoppers on cannabis plantsCrickets and grasshoppers

birds on cannabis plantsBirds

cats and dogs on cannabis plantsCats and dogs

deer on cannabis plantsDeer

gophers and moles on canabis plantsGophers and moles

rats and mice on cannabis plantsRats and mice

fungus gnats on cannabis plantsFungus gnats

leaf miners on cannabisLeaf miners

mealy bugs on cannabis plantsMealybugs

snails and slugs on cannabis plantsSnails and slugs

spider mites on cannabis plantsSpider mites

thrips on cannabisThrips

whiteflies on cannabis plantsWhiteflies

cannabis heath stressHeath stress

humidity and temperature in your cannabis grow roomHumidity and temperature

pruning marijuana plantsPruning cannabis

airy and loose marijuana budsAiry and loose buds

marijuana clones won’t rootClones won’t root

stretching marijuana plantsStretching plants

hermaphrodite marijuana plantsHermaphrodites

cannabis seeds won’t germinateSeeds won’t germinate

dark cycle interruptions cannabis plantsPlants won’t Flower

marijuana plant knocked downKnocked down plant

hard or soft water for cannabis plantsHard or soft water

cannabis and weatherWeather

overwatering and underwatering marijuana plantsOver- and underwatering

marijuana soil problemsSoil problems


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Comment Section

49 thoughts on “Symptom Checker - Identify Marijuana Plant Problems

By Rich on 5 June 2015

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.

By dickie fickl e on 12 August 2015

overwatering ! for sure

By steve on 6 June 2015

Best marijuana plant problems chart to date !!!!!

By Rob on 6 June 2015

I had to move plants out of grow box and put it back about an hour.

By John Cox on 9 June 2015

Thanks for the advice it will come in handy .I have done copied it down .Thank you again Robert .

By lee stanton on 11 June 2015

what is nutrient burn and how can i stop it.

By dickie fickl e on 12 August 2015

dont add too much nutes ,, if you do flush with three times as much water as media

By TxGrowman on 11 June 2015

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!

By jo on 11 June 2015

what is nutrient burn and how can i stop it.

By latewood on 11 June 2015

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. 🙂

By latewood on 11 June 2015

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.

By jo on 12 June 2015

thanks latewood. but what can we do to stop it ?,

By Allen W on 12 June 2015

Back off nutes

By Allen W on 12 June 2015

flush plant

By jo on 12 June 2015

thanks allen. stopped feeding.

By latewood on 15 June 2015

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.

By Jordan on 17 June 2015

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!

By Abo Adam on 30 June 2015

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

By latewood on 2 September 2015

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

By snickerdoodle on 25 July 2015

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

By mowerman on 29 August 2015

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

By mowerman on 29 August 2015

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

By latewood on 2 September 2015


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. 🙂

By vern on 30 August 2015

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

By latewood on 2 September 2015

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. 🙂

By bryce on 5 October 2015

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!!!!!!

By latewoodl on 10 October 2015


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".

By Panos on 27 May 2016

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.

By latewood.ILGM on 12 June 2016


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

By bojax on 3 July 2016

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.

By Niraj Thakur on 29 September 2016

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

By Roy ILGM on 30 September 2016

Hi Niraj, I'll have one of our expert growers look at your question but if you want to put up more information, the best place to go is our grow support forum 😀

By Kevin on 27 February 2017

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.

By latewood.ILGM on 30 September 2016


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.

By BikerBud on 18 February 2017

my leave's have yellow spots on the veins what causes this?

By latewood_ILGM on 20 February 2017

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. 🙂

By rip on 20 February 2017

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

By latewood_ILGM on 20 February 2017


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

By nick on 28 April 2017

hi! one question..!i saw some brown lines on some leaves one have a little very small hole 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!!!

By Roy ILGM on 1 May 2017

Hi Nick, I advise you to hop onto the support forum and put up a picture of your plant. Our experts there can help you identify the problem and its solution. – I❤️GM

By grmd420 on 8 February 2018

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?

By Nick on 14 March 2018

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

By chuck on 30 October 2018

I have tried to send pictures and they don't go to you chuck

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