Vote Now 🏆 for 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

Recommended

Grow QuestionsBlack/brown spots

Black/brown spots

Fishcakestarted grow question 5 years ago

hi all its currently day 14 of flower i have noticed that there is spots on another one of my plants hope you guys could help me out

Fishcake

Fishcake

Fishcake

Fishcake

Solved

Leaves. Color - Dark-brown

Leaves. Color - Black or grey

Feeding. Deficiences

likes

rhodes68answered grow question 5 years ago

Looks like the relationship between CA and Phos is a a bit off which can just get all mysterious. They work together, might try and add some or double check conditions but no diary so not much else I can tell you.

1 like

Complain

Selected By The Grower

Rap_a_capanswered grow question 5 years ago

Hi Bro, these spots & purple stems suggest P deficiency, common at flo stage. I don't add anything else because you didn't provide setup information. Cheers

1 like

Complain

Similar Grow Questions

Solved

Is this fungus infection or calcium deficiency?Plant seems fine overall but shows brown spots on some leaves (new and old). Week 4 bloom in soil. 3l rain water pH adapted + CalMag to 250 µS/cm. Crazy Hills fert. twice a week (EC 1600 µS/cm). Water pH 5.0, drain pH 7.4, drain EC 1400 ... 1500 µS/cm.

Leaves. Color - Dark-brown

7 months ago

1

1

Solved

Nutes Deficit - Yellow lower leaves and yellow tips. What to do?

Leaves. Tips - Die

Leaves. Color - Yellow

Feeding. Deficiences

7 months ago

3

1

Solved

Runoffs are significantly below inputs-Do I have a problem?Runoff continues to be a mystery. When watering I continue to get significantly less Ph and PPM (4.8 ph and 109 ppm) than my inputs (6.2 ph and 155 ppm) but the plant looks healthy. I have no idea what is going on or if its even a problem. Should I be worried and what can I do?

Feeding. Deficiences

7 months ago

6

4

Solved

Nutrient deficiency?My plant is not doing good and I sadly don’t know what’s wrong with her. I would be very happy if someone could help me solve this. My tent is about 26-29 degrees at day and 24 at night. RH is 60%

Buds. Not fattening

Leaves. Curl down

Leaves. Color - Dark-brown

8 months ago

1

1

Solved

Leaves showing issues. Can I still flip to flower?Week 5ish in veg. I was planning to flip on Saturday. I’ve had issues the entire grow. Supplemental cal mag feeding have helped.

Leaves. Color - Yellow

Leaves. Color - Dark-brown

8 months ago

2

3

Solved

Deficit or surplus Hey, Can someone Help me pls? Triple G Auto Week 9 Soil everything went great until today Starting some Brown Spots on the top leaves Maybe phosphorus deficiency or calmag deficiency? Fertilizer hesi half according to scheme watered two days ago with ph 6.4 Drain was ph 6.8

Leaves. Color - Dark-brown

8 months ago

2

1

Solved

Flecken auf Blatt und Halm oder Helikopter-Mutter Die 2 Flecken auf dem vorderen Blatt und die dunklen Stellen am Halm beschäftigen mich ein bisschen. Glaubt ihr, die Pflanze hat ein Problem oder mache ich mir mal wieder zu viele Sorgen? VP 10. Steht im 11l BB AllMix und wurde einmal am Anfang der VP mit 3l gewässert.

Leaves. Color - Dark-brown

Setup. Strain - Autoflowering

Setup. Outdoor

8 months ago

4

4

Solved

Smoking_Joe_Frasier

Discoloration underneath the leaves. Should I be concerned?

Leaves. Color - Dark-brown

8 months ago

2

2

Solved

Curled leaves and brown spots Please help! My Acapulco Gold suddenly showed leaf symptoms today. Shouldnt be a lock out, I always water with drain and use lower doses than the BioBizz chart recommends. Used Molasses two days ago, could that be the cause? Its the only plant that shows this signs.

Leaves. Curl up

Leaves. Curl down

Leaves. Color - Dark-brown

8 months ago

1

Solved

What deficiency is this ?What is happening to my plant right now ? I believe it is calcium deficiency also could be Manganese from the pictures. I did not add CalMag during the first weeks. Usually Calcium deficiency shows after 4 weeks and during flower but not likely in soil. Started around 6th week

Leaves. Color - Dark-brown

Setup. Strain - Autoflowering

Feeding. Deficiences

8 months ago

5

3

Solved

make_weed_not_war

Yellow leafes with Brown circles So the Easy Bud in the tent Looks Like trouble. The Leafs turn yellow with brown circles… im clueless what It could be but it does not look Healthy. The Leafs at the deepest bottom Look Fine… All Others dont Look good..

Leaves. Curl up

Leaves. Color - Yellow

Leaves. Color - Dark-brown

8 months ago

1

2

Solved

Deficiency?! Please help with weird Leaf signs :(This Plant didnt have any problems in This whole run. Sinne 1-2 Weeks she started showing These weird signs and i cant figure out what it is. I thought it could maybe be phosphorus deficiency or something. Got a lot worse in the Last few days! :((

Leaves. Color - Dark-brown

Leaves. Other

8 months ago

1

Solved

Two problems in a week. I diagnosed the first one based on similar grow questions (: maybe not right )First three photos appeared a week ago, I decided that it is calcium and took a more reliable Ph meter, maybe not right, but no new spots appeared. Second problem at the end of the week, 3 days after defoliation 2 large lower leaves and 2 leaves inside. 30 hours after watering.

Leaves. Color - Dark-purple

Leaves. Color - Dark-brown

8 months ago

4

3

Solved

longearringboy420

Black spots on leaves Black spots present on some fan leaves. During ~3rd month right now. Watering with HESI in Coco Coir, PH ~6 every time, 1/2 runoff water. For about 2 weeks prior to this, I also added very small amount of kelp powder. Soil seems fine.

Leaves. Color - Black or grey

8 months ago

2

Solved

Brown Spots on Leaves I’m noticing some light brown spots on my leaves. After researching it seems that it was either 1) Manganese deficiency 2) calcium deficiency or 3) overwatering. I don’t think I’m overwatering. It could be the nutrients but would like input!

Leaves. Color - Dark-brown

Leaves. Color - Mottling

8 months ago

5

3

Solved

longearringboy420

Black dots on leaves ?Late during flowering, no apparent bugs inside or anything visible. Not all the leaves, but some started drying and showing these weird black dots on it. Really not sure what this is, please help.

Leaves. Color - Black or grey

8 months ago

2

Solved

MarcoCasanova00

Pest infestation left my plant folded and weak. I treated it, but now blacked out leaves?Ants were farming an oval shaped bug's secretions that was eating my stem and going underground, leaving a trail of a film-like substance. Treated it with neem oil, cigarette butt tea, garlic and dishwasher soap to fend them off. Black leaves now. Tips?

Leaves. Color - Dark-brown

Leaves. Color - Black or grey

Other. Bugs

8 months ago

2

3

Solved

notice any nutrient deficiencies or toxicity ?Hi guys, I was wondering if you could tell me if you notice any nutrient deficiencies or toxicity auto 25° /55%rh / ts1000 distance 60cm 75%power 40 dli (photone) feed two days ago and still wet with 700 ml 0.5ml bllom Budcandy 1ml 1ml rhinoskin 0,5 calmag Ph 6.4

Other. General questions

Feeding. Deficiences

8 months ago

1

3

Solved

Black spots on leaves So I have those black spots on leaves on top of the canopy of my plants. Can someone please explain what are those and how can I treat it? Also the edges of the leaves on top of the canopy are brown and crispy.

Leaves. Color - Dark-brown

8 months ago

1

1

Solved

Autos reacting to All-Mix: Slight nitrogen overload?Pheno one showed very "leathery", weak, hanging leaves of dark green. Same time the fungus gnats had a run and the population doubled. After second LST also the stronger plant showed those signs on the younger upper leaves. Also curled down a little. Slight nitrogen toxicity?

Leaves. Curl down

Feeding. Deficiences

8 months ago

2

1