The Grow Awards 2025 🏆

Chat

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

Recommended

Back to Grow Questions

Cant find out what the trouble is.

I_roll_my_own_420started grow question 4 years ago

Cant find what is wrong. Leaves are yellowing and I cant find out why. Still about 4 weeks of flower to go.

I_roll_my_own_420

I_roll_my_own_420

I_roll_my_own_420

I_roll_my_own_420

Open

Leaves. Color - Yellow

likes

Answer

advice

NONSENSEanswered grow question 4 years ago

Hi there, A cannabis phosphorus deficiency generally appears on leaves from the lower/older parts of the plant. The lower leaves may turn dark green or yellow, and start getting spots or big splotches that look brown. Sometimes accompanied by a Calcium deficiency, as Phosphorus and Calcium interact with each other in the plant.

likes

Complain

NONSENSEanswered grow question 4 years ago

Good day. As I see not only yellow.

likes

Complain

Similar Grow Questions

Solved

Nitrogen toxicity or deficiency? Or just PH issue?Hi buds. Gonna need your expertisè again. My Grandaddy Purple auto is showing signs of something. Leaf claw: N-toxicity or PH issue Leaves fading: N-deficiency or PH issue What do you think changed this one leaf, and what do you think is going on with the other leaves?

Leaves. Veins - yellow between

Leaves. Color - Yellow

Feeding. Deficiences

19 days ago

5

3

Solved

Gorilla_cookies92

is this calmag defiency and nitrogen defiency? Couple of lower leaves turning yellow and couple leaves have brown Spot. Gorilla zkittlez auto day 39 and w is this calmag defiency and nitrogen defiency? Couple of lower leaves turning yellow and couple leaves have brown Spot. Gorilla zkittlez auto day 39 and week 2 of flowering. I use biobizz Light mix and biobizz nutrients and ph is 6.5.

Leaves. Color - Yellow

Leaves. Color - Dark-brown

17 days ago

2

3

Solved

Black tips and spots on the leaves I'm having problems with the leaves. I estimate that the plant has about two or three weeks left to live, and I don't want to have issues now. Some tips are darkening, and spots are appearing on the leaves

Leaves. Color - Yellow

Leaves. Color - Dark-brown

16 days ago

3

2

Solved

Proplems with leaves hi i got a question my plants show yellow leaves or damaged tips anyone knows whats going on? Lamp ts-1000 150w on 45% in the 4 week and only 2 feedings till now

Leaves. Tips - Burnt

Leaves. Color - Yellow

22 days ago

4

5

Solved

Yellow Spots and curling leaves Autoflower Hey there, One of my Autoflowers has some Problems but i dont know the exact reason. The plant has finished the second week and the leaves are curling and have some yellow Spots. She is in 11L biobizz light mix which i Mixed with 16g of greenhouse feedings Bio Grow at the beginn

Leaves. Curl up

Leaves. Curl down

Leaves. Color - Yellow

21 days ago

7

4

Solved

Hilfe!!!Liebe Grower, bitte um Hilfe... Seit 10 Tagen in der Blüte PH 6.5 CALMAG Probleme? Oder nährstoffmangel?

Leaves. Color - Yellow

21 days ago

2

4

Solved

a week later...what's wrong with her?she had issues-https://growdiaries.com/grow-questions/82295-mid-flower-yellow-leaves I flushed her a bit and then gave some CalMag and BioGrow+Bloom and Top. Regulated pH↓ and now the runoff=6.9 (was7.5) PPFD for main cola=800-900 Anything else I can fix? How long until harvest..

Buds. Not fattening

Leaves. Color - Yellow

Leaves. Color - Pale

20 days ago

4

Solved

Hungrig oder Calmag Defizit?Hi, jemand eine Idee ob ich ein Nährstoffproblem oder Calmag Problem habe? Symptome: helle Blätter, ganze Pflanze. Jetzt lila spitzen und Ränder dazu. Außerdem vereinzelt im mittleren Bereich (ältere Blätter) gelb.

Leaves. Color - Yellow

Leaves. Color - Dark-purple

20 days ago

5

2

Solved

Leaves keep turning brown and yellow It all begann with what I thought was light burn. I then considered it CalMag deficiency. Giving it CalMag did not stop it. My current guess is too low pH due to strip inaccuracies, so I gave it around 8 today instead. What do you recon, why could it keep getting worse?

Leaves. Color - Yellow

Leaves. Color - Dark-brown

8 days ago

4

Solved

DuschkabinenGrow

Plant deficiency pale/yellow leaves Does anyone have an idea what deficiency or issue my plant might be experiencing? Any suggestions would be greatly appreciated!

Leaves. Curl up

Leaves. Color - Yellow

Leaves. Color - Pale

7 days ago

4

4

Solved

Nutrient deficiency?Dear grower, I am having an issue with slightly yellow leaf tip. I only used BioTabs Plant Perfect Package. I am suspecting she needs some extra food, but I don’t want to over feed her. Considering giving her BioBizz Grow (little by litttle). Do you recommend this technique?

Leaves. Color - Yellow

11 days ago

7

6

Solved

Sudden Leaf Yellowing – Lighting Issue or Something Else?Hello! Yesterday, I noticed the top leaves turning slightly yellow, but today it looks dramatic. Check the pictures—leaves are yellowing and drying out rapidly. It’s only affecting the central leaves, so I suspect a lighting issue, but I’d like to confirm before taking action.

Leaves. Curl up

Leaves. Color - Yellow

a month ago

3

Solved

SmallCannabisDojo

Potassium excess, PH or calcium?What happened to my plant. Is this excess potassium, ph imbalance or calcium issues? This only happens on some lower small leafs.

Leaves. Color - Yellow

a month ago

7

6

Solved

About plants ..For those who have dealt with nitrogen deficiency, after correcting it, did the affected leaves regain their color, or did they stay the same while only overall plant health improved?

Leaves. Color - Yellow

24 days ago

10

7

Solved

What issues do i have with leaves?I couldn‘t figure out the issues so i‘m leaving it to community. BioCanna soil with BioVega, BioBloom, BioFlores and Bio Rhizoton in 11l pot, Lumatek ATS 200W PRO (75%) in a 80x80 mamooth box. Light is at 50cm, climate is at 23C and 53% Thank u guys!

Leaves. Color - Yellow

a month ago

4

Solved

Verfärbte Blätter Verfärbte und teilweise vertrocknete Blätter bei meiner Autoflower in Woche 9. Nährstoffmangel, Nährstoffüberschuss, zu viel Licht? Grobe mit biobizz biogrow, biobloom und topmax. Woran könnte es liegen?

Leaves. Color - Yellow

Leaves. Color - Dark-brown

a month ago

3

3

Solved

Leaves turning yellow and dying I have a plant that gets a lot of rust spots, even though I give it CalMag once a week. That plant also started getting a handful of leaves that turn yellow and fall off. Is there a nutrient I'm missing in my regiment? Should I do CalMag every watering for the rust spots?

Leaves. Dropping off

Leaves. Color - Yellow

Feeding. Deficiences

a month ago

2

Solved

Any thoughts on what it could be? 🤔I did some research and have my suspicions, but I'd like to hear your opinion! 🤔

Leaves. Color - Yellow

a month ago

4

3

Solved

mid-flower yellow leaves Hello! I'm growing my first non-auto, a SkittleZ, it got quite small and the leaves are yellowish,I'd like to know what mistakes I made and what I can do to help her Mars Hydro TS1000 and only BioBizz nutrients. Temp is around 18C at night and 25/26C during the day, 40% hum

Leaves. Color - Yellow

Feeding. Deficiences

a month ago

2

6

Solved

Fan leaves turning extremely yellow late flower Hello. Day 61 of flower, Green Crack 2.0 by Humboldt seed organization. Soil based. All of a sudden all the fan leaves are turning yellow. Trichomes are clear, no exceptions. Is it from finishing or did I mess up watering/nutes in the last couple of weeks? Thanks in advance.

Leaves. Color - Yellow

2 days ago

4

4