The Grow Awards 2026 🏆 
Sudden brown on leaves
Misanthropestarted grow question 4y ago
These brown patches appeared in the last 24 hours. It rained heavily during that time. Any ideas what the issue is or what to do to treat it and/or avoid spreading?
likes
Similar Grow Questions
Solved
hweixd
Day 4, after emerging. Is this coloration on the cotyledons okay?Humidity is 55 - 70, temp is around 20-24c, 50w full spec led
It's my first time, and i think i have been watering it too much
I also fed it 2-0-0 npk water with 4ml per liter and I since learned it's not okay. Will it recover? Is this too little grow for day 4?Leaves. Color - Yellow
Leaves. Color - Dark-brown
2y ago
4
1
Solved
docpayce
Is this fungus infection or calcium deficiency?Plant seems fine overall but shows brown spots on some leaves (new and old). Week 4 bloom in soil. 3l rain water pH adapted + CalMag to 250 µS/cm. Crazy Hills fert. twice a week (EC 1600 µS/cm). Water pH 5.0, drain pH 7.4, drain EC 1400 ... 1500 µS/cm.Leaves. Color - Dark-brown
2y ago
1
1
Solved
DabblingDoggo
Brownish Spots on 2 Older Leafs. Young plant.I searched it up before posting this and what I found is: Leaf spot, canker, and fungus: Brown leaf spot, Yellow leaf spot, Cladosporium stem canker and Chaetomium fungus. Solutions I found in the comments below. What do you guys think? Can it be heat (a lot of hot days here)?2y ago
5
5
Solved
Buddabud
I am seeing brown spots on the smaller leaves of upper colas, plant looks healthy besides them, does anybody know what they are? Lsf maybe?Week 10
Leaves. Color - Dark-brown
6y ago
2
2
Solved
Professor_Chaos
I have only been using CalMag at half strength.. I normally go full.. So I suspect its Cal def.... But never seen it this color.. Different strains can show differently tho.. Help! Just on the 2 remaining fan leaves.. Not spreading to branches... Yet.Week 4
Leaves. Color - Dark-brown
5y ago
2
Solved
EmeraldGrows
Leaf issues with 3 Pineapple Express Autos - is it burn or deficiency?All 3 plants are having issues to the lower leaves. They are dried and brown blotches, brown edges of the leaves, leaves drooping off and curling down and brown. They switched to Canna Terra Flora two weeks ago - is this a over feed or deficiency?Leaves. Edges burnt
Leaves. Curl down
Leaves. Color - Dark-brown
5y ago
2
2
Solved
Someboty
Brown Leafs?What is going on here?
i saw that my plant got some issues with its leaves.
I got my self Bio Bloom from bio bizz my friend told me it could help but it is already day 3 and it did not get better. what should i do?Leaves. Color - Dark-brown
Techniques. Defoliation
2y ago
1
4
Solved
Magic43562
Brown spotsBrown spots only on 1 leaf, is this a problem? Wasn’t there this morningLeaves. Color - Dark-brown
6y ago
4
3
Solved
BigBuddy91
Cotyledon issue from seedlingHave seedlings from Auto Colorado Cookies (Dutch Passion). One already has cotyledons, but not opened yet. I see some yellow and bigger brown spot of the tip. In the beginning I had 250 PPFD, could this be the issue?
Now I am around 100 PPFD and put the light a bit up. See photo.Leaves. Color - Dark-brown
7mo ago
2
Solved
McLovin69
When should I put the pellet in the 5 gal pot??I am currently growing a tangie'matic with "a pot for pot" grow kit. At first the seed germinates in a pellet. Then it says "put pellet in 5 gal soil mix after 10 days or when the third set of leaves matches the second." I did it after 10 days and this happened.Leaves. Curl down
Leaves. Color - Dark-brown
6y ago
2
3
Solved
AlienScrOG
leaf !?... no real problem.. is it a stress due to excessive handling of fertilizers or the breaking of the field in stops and leaves for training?good morning guys I noticed some burnt leaves I don't understand if it was a slight lowering of the level of the dwc ..because I noticed some slightly dry upper roots then I increased the level and after the roots improved ... I don't understand if that machine is due to stress o4y ago
2
Solved
JSanchezz
Mid Flower Dosi Dose F1 Auto issueDOSIDOSE F1 Auto
Day 59
26-27c 56-58RH VPD ~1.61
C02 1100ppm
they Start fatten now (i hope) in the back is a more mature plant
What can that be on the leafes ?
Bio Tabs Organic Soil good aregation
inly water from here on hope they r done in ~16Days
Cant do anithing right ?Leaves. Color - Dark-brown
7mo ago
1
4
Solved
NarcissisticEcho
Copper color leavesCopper color leaves. Also looks kinda dead. What can it be?Leaves. Color - Dark-brown
4y ago
1
Solved
BadGrower
Need experienced organic grower help!Growing in coco with organic dry amendments and worm castings. Had to give calmag 2 times at a low dose. Water PH 6.1-6.4 carbon filtered every time. Just flipped to flower yesterday. Weird spots on leaves. Phosphorus or calcium issue? Plant is growing vigorously just a few spotsLeaves. Color - Dark-brown
4y ago
2
Solved
Growdaddy420
When growing different strains in a RDWC system how do you balance plants with different nutrient needs. My amnesia auto ran into a major cal-mag issue and now is experiencing nitrogen toxicity, while my feminized Jack Herer's are largely unaffected. Thanks for the advice.Week 7
Leaves. Color - Dark-brown
7y ago
3
3
