The Grow Awards 2026 🏆 
Yellowing of undergrowth within 2nd week of veg
CoastalEisenbergstarted grow question 4y ago
What is causing my plants to yellow in the lower growth? Using Coast of Maine soil so shouldn’t need top feed for another couple of weeks. I’ve tried a mixture of liquid calcium (organic) and epsom salt to provide cal mag organically. Any recommendations?
Open
Leaves. Color - Yellow
likes
Answer
Robertsanswered grow question 4y ago
It's magnesium deficiency, needs more, more often
1 like
Complain
Ezzjaybruhanswered grow question 4y ago
Def looks like mag. If you’re confident it’s getting a good amount now, are you sure pH is in range? Cal and mag i believe taper off uptake when you get below 6
1 like
Complain
Similar Grow Questions
Solved
Islandgrowbro
What’s going on here?Blessings grow bros! I’m having an issue not sure what the problem is could you assist?
Planted in soil.
Feeding them on a synthetic fertilizer mix 20-20-20, CalMag, 5-2-4 organic fertilizer mix.
Spraying with Lost Coast based on directions and parasite control.
Let me knowLeaves. Color - Yellow
8mo ago
5
3
Solved
sdelapena85
Anyone out there able to identify N deficiency on newer leaves or if the lighter color is just the way the strains new growth looks? I worry and have the habit of wanting to do more more more which I am trying to stop. Trying organic. Should I roll on, feed N, or top dress?Week 8
Leaves. Color - Yellow
7y ago
1
1
Solved
TCH0808
Veg Nute IssuesHas anyone seen any diaries that catalog a successful sick veg -> healthy flower recovery? I'm curious to see how sick growth transitions to healthy growth over several weeks. Current issue: a) LED intensity, b), N excess, c) PK def, or d) cal/mag def(rust on leaves top and btm)?Week 6
Leaves. Color - Yellow
3y ago
7
6
Solved
Professor_Chaos
Cant seem to shake acidic coco/perliteCan't seem to shake my acidic reused coco/perlite mix.. Ph going in is 6.2 - 6.3... Runoff is coming out 5.8 - 5.9.. Ive even ran 6.5 thru the mediun and still coming out at 5.8 - 5.9.. Should I try 7.0??? Help please!!!Week 3
Leaves. Color - Yellow
5y ago
2
2
Solved
hooolian
Yellow leaves - Sohum living soilHave been growing these in sohum living soil - they are nearly 9 weeks old - they look great but there are many yellowing leaves - would a small dose of blooming nutrient help at this stage? or is all normal and should just use water as normal til the end? thanks!Week 8
Leaves. Color - Yellow
3y ago
2
2
Solved
bigbud1080
Nitrogen Def with PPM 920?? - DWC OutdoorMy Blue Cheese is yellowing on the bottom leaves. I think it's nitrogen but I just changed the res last week, balanced the ph and set the ppm is 920.
Canna Aqua A+B and Canna Rhizotonic
Ignore wet leaves in photo, i use a foliar spray.
Also have some burn, anyone seen this?Leaves. Color - Yellow
5y ago
2
Solved
BongRip
Deficiency? Pls Help!These spots started to show up 3,4 days ago before I even topdress my plants. I topdress it, also increased nutrient a little bit, but it doesn't seem to go away. The stems are a little red. Is it P deficiency? What seems to be a problem here!??Week 8
Leaves. Color - Yellow
5y ago
4
8
Solved
TheGrowTurk
Leave troubleHello grower college's!!
As you can see I have some leaves that are yellowing. The leaves I took are from the lower canopy.
This is the 3th day since I set the timer on 12/12.
Please some help and tips. I use the Biobizz line on soil.
Thank you 😘Leaves. Tips - Burnt
Leaves. Color - Yellow
5y ago
1
3
Solved
Chow_13
PH Fluctuations and/or Nutrient Issues?I'm Running a Recirculating Deep Water Culture System( hydro). Had PH dropping dramatically a few days back but did a full water change and everything has stabilized. Just Flipped to a 12/12. Does it look like that was the issue or is it nutrient toxicity/deficiency. Or Stress?5y ago
2
Solved
southerngrower2020
Leaf damage and flower analysisAsking for thoughts on leaf damage. I think there may be nutrient shock so I will be reducing PPM to 800 to see if that helps. I am confused by other problems seen on a few leaves. I also want to ask if I am getting close to harvest (check flower pics) since this is an autoflower6y ago
4
3
Solved
Weedovaurus
Lower leaves yellowing and curling downDo anyone know what's wrong ? I was thinking they were getting to much light in the tent with my flowering autos... I'm quite sure it's not about wateringLeaves. Curl down
Leaves. Color - Yellow
Leaves. Color - Pale
5y ago
3
8
Solved
Maskedcucumber
3rd week since 12/12 and chlorosis is getting worse !!! Will my crop be crappy ?Brought EC to 1.6, added 21ml of calmag, had to add 2L of osmosis water because the EC was 1.78. I changed the bad Ph probe and I let it fluctuate between 5.75 and 6. Should I remove the aluminium foil on the pot to let them breathe ? Not sure they are overwatered, I'm desperate4y ago
3
4
Solved
Dr_Big_P
Help needed.Any suggestions on nutrient uptake let me know so I can adjust.??? Thanks any tips will doWeek 2
Leaves. Color - Yellow
4y ago
4
4
Solved
igglepuff
follow up q. flushed last week & on nutes yesterday morning again when watering with a bit extra N/6.4ph. This morning more and more fan leaves are yellowing and even some smaller ones now. any ideas? not sure what to try, seem to be getting worse. did mess up bad?:(Week 7
Leaves. Color - Yellow
5y ago
3
Solved
PietertjeOpDeLijn
Newer leaves also turning yellow at the tips. Flush?Newer leaves also turning yellow at the tips. Started to give the plant Terra Bloom,Sugar Royal, Pure Zym and power roots again after only giving it water for 2 weeks long.
Is this a nutrient burn and will a big flush help it out?
Doesn't a big flush overwater the plant?Leaves. Color - Yellow
3y ago
4
9
Solved
PurpGod
Dying leaves helpLeaves dying Turing yellow and brownLeaves. Tips - Die
Leaves. Curl up
Leaves. Color - Yellow
5y ago
2
3
