The Grow Awards 2025 🏆 
By continuing to use the website or clicking Accept you consent to our cookies and personal data policy and confirm that you are at least 18 year old. For details please see Privacy Policy and Terms
Accept
Leaf diagnosis.
Cannabotixstarted grow question a year ago
I need help on identifying this leaf issue are we looking at potassium def or something else. They just started flower and a week ago it was mag def and I've been supplementing on the light end cal/mag. Thank you all for the great wisdom.
Open
Leaves. Tips - Burnt
Leaves. Color - Dark-brown
likes
Answer
Cannabotixanswered grow question a year ago
Lock out from adding cal maybe to often? I feed the lowest amount every water for about a week and half since was def then was going to switch to every other. I always ph my water so Idk if it's a ph prob.
likes
Complain
Similar Grow Questions
Solved
Mephistacheles
Black spots spreading // Need your help!Anyone got a clue what this dark spots could be? It started in a corner of the tent with 1 plant a few weeks ago and now it has spread to another. I suspect pH issues and a nutrient lockout bc of that. Not sure if its the same issue though..Could be an infection as well...Leaves. Color - Dark-brown
Leaves. Color - Black or grey
2 years ago
1
4
Solved
Tiz_aka92
Leaf Issue!Could someone help me understand whether there is a problem a deficit or an excess.Leaves. Wilting
Leaves. Color - Dark-brown
Leaves. Other
2 years ago
5
6
Solved
GreenCosmos
Calcium deficiency?Saw this little brown/yellow parts today.
She is in BioBizz LightMix Soil and gets 0.3ml/L BioBizz CalMag 3x per week.
pH is above 6.5 .
Today I gave her 1ml/L CalMag.
Was this the right choice?
Is this a calcium deficiency?Leaves. Color - Dark-brown
Feeding. Deficiences
2 years ago
2
2
Solved
JohnyV
Hello friends, do you know what kind of issue could be these brown spots. It appeared one day ago. I grow in coco perlit with canna feed according feeding chart. Thank you for your advices..Leaves. Color - Yellow
Leaves. Color - Dark-brown
a year ago
5
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)?a year ago
5
5
Solved
Glenmo
Brown patches on leaves, thought it was calcium deficiency symptoms.Having problems with brown patches, (see last 3 pics week 10), a quick google and I went with adding more CalMag but it's got worse the further into flowering I go, the farthest behind plant has least, furthest ahead is worst, any ideas?, many thanks in advance :)Week 10
Leaves. Color - Dark-brown
a year ago
4
4
Solved
MendocinoGreeno
Deficiency or excessHello colleagues,please advise me, what could it be? the tips of the leaves are sometimes lighter, and the holey leaves? I didn't find any pests in the tent. I use the AH set. Once a week I only rinse with water with enzymes. Can you think of anything?Leaves. Tips - Burnt
2 years ago
4
6
Solved
aDriftwoodKing
Yellow leaf with brown spots?Plant has only 1 leaf like this, and the opposite fan leaf appears normal. Another plant has a similar leaf like this but with less spots, and one yellow or bleach spot. But only 1 leaf on each plant. My latest diary entry has more info, any help appreciated.2 years ago
6
5
Solved
JoeShmo420
What is your best advice for helping plants look great and not dried out on any edges?Brown edges got me down. I'm sure its just humidity. I've been adjusting the light. Could it be more? whats your best seasoned advice to keep those edges looking crispy... (Good) ? not in the wrong way!Week 4
Leaves. Tips - Burnt
2 years ago
2
2
Solved
MetaSamsara
How's the quality?How would you rate the quality of these plants? The dark brown leaves have me self conscious of the roots situation. DIY supersoil mix recipe here: https://pastebin.com/pbxMZysq I've added more dolomite & guano as topdressing and fed liquid calmag and potassium during flowering.Week 13
Leaves. Color - Dark-brown
2 years ago
5
4
Solved
fiatchd
Leaf problemsI think I did use too much fertilizers, whats happening here?
https://growdiaries.com/diaries/180523-grow-journal-by-fiatchdLeaves. Color - Yellow
Leaves. Color - Dark-brown
Feeding. Deficiences
2 years ago
2
5
Solved
BLAZED
Leaf problemsMy leaves are getting yellow from the bottom, and some have burnt tips. It started when she is in flower.
I often feed Powder Feeding from Green House. PK+ (NPK: 0-30-27) and Hybrids (NPK: 15-7-22) the PH is 6.5
They say this strain wont need much nutrients but can handle more2 years ago
6
7
Solved
Cyborg420
Dealing with Nutrient Burn and Salt Build-UpI've observed salt build-up and nutrient burn in my plants recently. I've taken action by flushing and removing 60% of the affected leaves. Now, I'm considering whether to remove the remaining affected leaves and when to proceed with top dressing. Please advise.Week 6
Leaves. Tips - Burnt
2 years ago
2
2
Solved
Vril_Ya
Leaf burnt edgesHi, I'm a first-time grower. Is this a sign of nitrogen deficiency in my Mimosa seedling?ThanksLeaves. Edges burnt
Leaves. Tips - Burnt
2 years ago
3
2
Solved
AlpAge_Cino
Discolored, burnt and curled up tips on higher leavesSeveral symptoms, always on tips of higher leaves : they are discolored/burnt or burnt/curled up. LED @40cm (deemed 70% of 300W) and I just gave them the 2nd flowering feeding, 4 days after first one (pots were very light). I was planing to start compost tea... What should I do ?a year ago
3
2
Solved
m1kax
leaves brown stainsis my 1st time growing weed.
my plants start get this brown stains on top leaves 2 weeks ago;
i check ph was 5.95; so i think this could be calcium, because internet say they cant absorb calcium;
i have high humidity before the stains appear like 80% but was only 4 or 5 days.Leaves. Color - Yellow
Leaves. Color - Dark-brown
Leaves. Color - Black or grey
a year ago
2
4