Check the winners The Grow Awards 2026 🏆
Start My Diary
Start My Diary
Log In
Start My Diary
Home
Diaries
Strains
Shorts
Questions
Contests
Growers
Seeds
Breeders
Nutrients
Equipment
Blog
English
Log In
Sign Up
Following
Follow
Brands
&
Growers
to get updates
Back to Grow Questions
Some help, please.
BrazilianKush
started grow question 5y ago
Ph issue or cal mag deficiency?
Open
Leaves. Color - Yellow
likes
Answer
Similar Grow Questions
Solved
Grumpy
Yellow leaves
Hi guys! I have little problem with my plant. But idk the ph or nitrogen is wrong :/ So few leaves start to yellow or lime green.
Week 4
Leaves. Color - Yellow
6y ago
1
1
Solved
elevensixty6
Growing in FFOF with some HF but have nutrient issues...have only given CalMag with RO water and this is what I've got.
Wedding Cake nute burn or possible P deficient with yellowing slightly down the edge? Also may have N toxicity with curling leaves? Blueberry also has slightly burnt tips, both plants have yellowing in the oldest growth. All in diary pictures. Thoughts? And how do I fix it?
Week 4
Leaves. Edges burnt
Leaves. Curl down
Leaves. Color - Yellow
5y ago
2
2
Solved
GrislyOldVet
Sligthtly Yellow Leaves
I'm growing 2 Mephisto Canna Cheese seeds. Canna #1 is looking very healthy and green. Canna #2 is healthy (ish) but its branches are more spread out and the leaves are a bit yellow green. I'm trying to figure out if I have a problem with Canna #2 before it gets worse.
Week 3
Leaves. Color - Yellow
2y ago
1
8
Solved
Brent_60s
Yellowing
For some time now their has bin two small areas about the size of your fist that had yellow spots so I tryed giving it Cal-Mag extra in with its feedings but now all of a sudden the hole plant looks like some one splattered it with yellow
Week 21
Leaves. Veins - yellow between
Leaves. Color - Yellow
3y ago
5
Solved
Hix57
Jaunissement, excès ou carence ?
Ma Amnesia présente une décoloration rapide des feuilles en jaunes. Je pensais qu'elle avait un excès car les pointes brûlait J'ai effectué un rinçage et mis une alimentation douce pour repartir mais le problème s'est aggravé et a accélérer le jaunissement. Merci d'avance ! 🌱
Week 10
Leaves. Color - Yellow
2y ago
3
5
Solved
Greatgrowman
Yellowing new growth!?
New growth is yellowing is this nitrogen deficiency? And it’s only happening to this strain. Also growth in general has slowed. Temps. Have been getting down to about 66-67F Bc of the cold front that came through.
Week 3
Leaves. Color - Yellow
6y ago
1
1
Solved
electabruce420
What can be the cause of this? deficiency or toxicity?
Hello! I'm on week 8-9 on my auto from Atlas Seeds, I have a grow journal of her, a few days back some yellowish on the outer parts of the leaves started to appear, I got a picture today that may give some insight into it.
Week 9
Leaves. Color - Yellow
4y ago
6
4
Solved
TrulyScrumptious
Fan leaves yellowing
Hi there, today I noticed that some of the fan leaves had this weird yellow tattooing on it so I want to share it to hopefully understand what it indicates. Please refer to photo. The one in the photo is the most affected, there are a few others with the same but to a less degree
Week 6
Leaves. Color - Yellow
6y ago
1
Solved
TheMan
The leafs started to look yellow in the middle when I checked on them today. They looked fine to me yesterday so I guess this happened in the past 24-48 hours, not sure why. It can be seen on Day 12 pictures. Is this normal or I should be worried?
Week 2
Leaves. Color - Yellow
8y ago
5
3
Solved
guerilla
Yellowing leef and rusty spots
So now iv just noticed. Hiding under some greenery. A yellow leef... Can someone please give me advice on what this is and what to do??? Should i cut it? Increase calmag?
Week 6
Leaves. Color - Yellow
6y ago
5
3
Solved
Slurpy_Terpy
Yellow leaf tips on healthy plant in dwc week 8 from seed vegging
Why are the tips of the leaves yellow on the highest growth points of the Brain Cake? - light burn? Since a few days the light is at 80% (mars sp3000 300w full spectrum led in a 60*120cm at 80cm above the top of the plants) - nutrient burn/shortage? Res changed a few days ago
Week 8
Leaves. Color - Yellow
6y ago
3
4
Solved
bagmuguri
Ph lock?
What kind of deficiency is this? Magnesium and K ? Im feeding the normal dose so maybe just little ph lock? I think ph is around 6! Thanks
Leaves. Edges burnt
Leaves. Color - Yellow
4y ago
1
1
Solved
bigbud1080
Do I have an Iron Deficiency, if so How do I increase Iron levels (Already using Calmag)
I think I have an iron deficiency. New Growth is appearing yellow. HYDRO Rain water - (20ppm) PPM 750-900 (just upped) Canna Aqua A+B Calmag (0.35ml/L) PH was 6.2 (as there was a calcium deficiency so I raised it slightly) PH is now 5.8 (I read lower PH is better for Iron Intake
Leaves. Color - Yellow
6y ago
1
Solved
Mark3RocketSpecial
Nutrient lockout?
Having a problem with bottom leaves turning yellow and dying. Starts off with brown on edges and tip, then leaf yellows and dries up. Potassium deficiency? PH problem? I flushed plants yesterday with 6.5 ph water and sledgehammer flush from fox farm. Pictures on week 10. Thanks!
Week 9
Leaves. Curl down
Leaves. Color - Yellow
5y ago
1
1
Solved
ChitownCannaChica
Auto flowers bottom fan leaves turn yellow—- cause and defoliation?
My plants are about week 3 into flower and the bottom fan leaves are Turing yellow and dying out—- is this normal? Should I defoliate these off an auto during flower? How to correct???
Week 6
Leaves. Color - Yellow
6y ago
4
3
Solved
Misanthrope
Strange yellow patches
This is a new one for me, sont think I've ever seen discolouration like this before. My first thought was having left some nute solution on her leaves after feeding but pretty sure I've ruled that out and more leaves have begun to show the same discoloring. Any advice appreciated
Week 12
Leaves. Color - Yellow
4y ago
2
5
Solved
HAILEKINGNATTY
Light stress or Nute Problem??
Would this be a light stress problem or a nutrient problem? Seems to be only the ones on the top so I'm guessing lights but want to be sure.
Leaves. Color - Yellow
2y ago
3
3
Solved
999_420
Beginner Grow – Still Getting Leggy Seedlings? please don't judge. the other plants are for using the electricity more efficient. planning to move o
Beginner grower in Germany. Strains: Outdoor Classics. 1st batch (1mo old beginning oudoors then moved inside with lamp) + 2nd batch (2w) stretched. Using Sunlight Stixx 50 at 60% dim, 50cm distance, seedling soil. Not sure if light settings are the problem. What are next steps?
Leaves. Color - Yellow
Plant. Too tall
Setup. Lighting
1y ago
4
2
Solved
ThatFcukinChronic
Deficiency?
My current grow is on its 5th week of flower and many lower leaves on each plant have begun to yellow then develop brown spots. I’ve did a little bit of research and I think it could be a nitrogen deficiency. Any help is appreciated.
Leaves. Curl down
Leaves. Color - Yellow
5y ago
2
5
Solved
PaxIlluminare
Does anyone one know the deficiency causing the leaves to yellow in this fashion?
Leaves. Curl down
Leaves. Veins - yellow between
Leaves. Color - Yellow
4y ago
1
1