The Grow Awards 2026 🏆

Back to Grow Questions

Grey leaves

herbalistsswordstarted grow question 5y ago

Noticed some leaves getting a brown grey colour. Any idea what this is? Seems to only affect leaves on one branch

herbalistssword

herbalistssword

Solved

Leaves. Color - Black or grey

likes

MangoDuduanswered grow question 5y ago

I think calcium deficiency next to the clorosis the leaf will start necrosis if is calcium def ✌️🏽

likes

Complain

Selected By The Grower

Similar Grow Questions

Solved

what cause it，Is it normal?

Leaves. Color - Yellow

Leaves. Color - Dark-brown

Leaves. Color - Black or grey

5y ago

2

5

Solved

Grey spots appearing on both sides of leaves on this seedling. Already receiving light feed grow+calmag. What could this be?

Leaves. Color - Black or grey

5y ago

2

2

Solved

Black marks on leaves of a slow grower.Noticed there's black markings on the edges of the leaves on our slowest growing plant. My initial thought was water droplets sitting on it before it had fully broken out or could it be something else?

Leaves. Color - Black or grey

5y ago

1

1

Solved

Hello guys! A have a big problem Hi there. Today while checking my lovely flowers i found this plant woth this kind of leaf. It has more than one leaf like this the same plant. Anyone has any idea

Leaves. Color - Black or grey

5y ago

2

2

Solved

Flower discoloration All flowers of one of my two plants have grey/black discolorations, is this something to worry about? My other plant is totally fine.

Buds. Other

Leaves. Color - Black or grey

3y ago

6

6

Solved

which deficiency?what deficiency does this look like? (specifically the plant with the yellow tips,blackish leaves,and brown spots on lower leaves) ph is around 5.9 but also i know my meter is probably not accurate. i thought i was underfeeding if anything,did have root rot.

Leaves. Color - Black or grey

5y ago

4

3

Solved

Weird coloured leaves The leaves are yellow a bit on the outside and just today noticed that it looks kind of black too. Anyone know if this is because of a certain deficiency?

Leaves. Color - Black or grey

5y ago

5

5

Solved

Bud leaves turned black Top leaves turned brown overnight, That day I did come home to a disturbing temp off 31oC . It’s the black Mini leaves in buds that are worrying me more. lights came on accidentally for two hours so gave her 16hrs dark and back to 12/12 This may have contributed.

Leaves. Color - Black or grey

5y ago

1

Solved

Leaf Deficiency What deficiency do you think this is?

Leaves. Color - Black or grey

5y ago

4

4

Solved

All_our_small_plants

Krankheit oder Schimmel?Sie hat ihre ersten beiden echten Blätter hervorgebracht, die eine Krankheit zeigen,aber es könnte sich auch um eine Pilzinfektion oder Schimmel handeln, der die Pflanze befällt. Was meint ihr was es ist? überlebt sie es?

Leaves. Tips - Die

Leaves. Color - Black or grey

4mo ago

2

3

Solved

Dark tips it seems to me that the tips of the leaves have a very dark color, it looks like an excess of nitrogen but in three weeks I have never fertilized and the only additions to my biobizz light mix are a sprinkling of guano kalong and 10% of worm humus biobizz.

Leaves. Color - Dark-purple

Leaves. Color - Black or grey

5y ago

4

3

Solved

Black growth seedling One of my 10 day old purple punch seedlings has some black stuff on its new growth in the center. My older PP had it too and she’s big now and doesn’t have it anymore.Still is this anything to be concerned about?

Leaves. Color - Black or grey

5y ago

4

Solved

What to do? → BF Runtz Auto - Day 42 - RH70, 80F in BioBizz Light Soil On my last post, I was advised I have N tox, so I watered w/o BioGrow, just BioBloom and it's gotten much worse. The runoff EC was 1.5 (watered with 0.8, runoff pH was okay), so I’m guessing it's salt buildup. I plan to flush when this watering dries out—any thoughts?

Buds. Not fattening

Leaves. Color - Yellow

Leaves. Color - Black or grey

1y ago

1

Solved

leaves brown stains is 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

2y ago

2

4

Solved

Problem with plants in the 3rd week of vegetation.I'm posting again because I accidentally marked it as resolved. I was using BioBizz CalMag from the beginning, but when I switched to Advanced Nutrients, I stopped because Ph Perfect Sensi Coco Grow A and B already contain CalMag.

Leaves. Curl up

Leaves. Curl down

Leaves. Color - Black or grey

1y ago

1

2

Solved

Yellowing to slight grey leaves What's the cause of the older yellowing leaves with some grey and the slow spread to the newer growth? I'm between pH problems and or deficiency but not too sure.

Leaves. Color - Yellow

Leaves. Color - Black or grey

5y ago

3

3

Solved

First time DWC, day 70, 3 weeks in flower. Nasty rusty spots appear on lower leaves. Is this CalMag or else? Please help understand and fix, thank you :)I'm using TA Tripart, current EC is 1.6 - ph 5.5-6.5. Everything was smooth until week 10. Two weeks ago I started adding Plagron Power Buds and Green Sensation. Yesterday added CalMag to see if it helps, but it doesnt seem to... She drinks a lot, ph mostly goes down, EC static

Leaves. Color - Dark-brown

Leaves. Color - Black or grey

Leaves. Other

9mo ago

7

7

Solved

Is this sign of nutrient lockout? I have moved her to a bigger pot now, that said I’m worried I’ve been testing my PH wrong, I uploaded a pic (day 26) is she starving? Up til now I haven’t fed her anything but water

Leaves. Color - Black or grey

6y ago

2

2

Solved

Leaves are turning into dark green with a plastic-like texture I have 3 ladies in my tent. While the others looking healthy, one of them has a darker green tone with a texture like plastic and shiny. Everything is the same (fertilizer ratio, coco medium), however the one on the picture has a problem. What might be the problem folks? 😩

Leaves. Curl down

Leaves. Color - Black or grey

1y ago

3

2

Solved

I’ve never seen this before?!Weird spots on leaf’s I’ve never seen before. Growing in coco with dry amendments and worm castings. Ph 6.7/6.5. Just gave some compost tea earlier today. And earlier this week some GH calmag because some of them are showing deficiencies for that. But what are these weird spots?

Leaves. Color - Black or grey

4y ago

5