The Grow Awards 2026 🏆

Back to Grow Questions

Nitrogen toxicity?

RallyAutosstarted grow question 5y ago

Are these dying leaves a result of the nitrogen toxicity or something else? Thanks for all your help!

RallyAutos

Solved

Leaves. Other

likes

The8thChevronanswered grow question 5y ago

Could be really bad light stress... My guess would be that a high PK nute has locked out calmag and other micronutrients. If you're using a booster, roll it back a bit. As always, check your pH and EC going in and coming out.

1 like

Complain

Selected By The Grower

Fruitgroweranswered grow question 5y ago

I had this before and although not entirely sure I put it down to a pk overdose. N Overdose looks very different - dark green claws.

likes

Complain

Similar Grow Questions

Solved

Crispy leaves?Crispy leaves developing as it flowers. Seems to just be those that had some spots from what appeared to be a magnesium deficiency. I hit it with cal-mag and the spots stopped but recently the most affected leaves are shrivelled. Only maybe 4-6 leaves right now.

Leaves. Curl up

Leaves. Other

5y ago

1

1

Solved

Should I be removing sick leaves?When running into issues with yellowing and necrosis, is it better to leave the affected fan leaves of to take them off? Worried removing so many might have hurt me more than leaving them and trying to just fix the issue.

Leaves. Other

5y ago

1

1

Solved

Hi does anyone use the 48hrs of darkness before with an autoflower harvesting and if so when is the best time to do it? Cheers

Leaves. Other

6y ago

3

1

Solved

Is she a write-off?Hey guys, my GSC seedling is about a week old. She had some problems getting rid of her seed head, and I managed to fully remove the seed coating and membrane just over 24hrs ago. Is she a write-off? It’s not looking too good

Leaves. Other

Germination. Paper

Germination. Substrate

3y ago

5

5

Solved

light and dark green leaves top leaves light and dark green. is it calcium problem ?

Leaves. Other

4y ago

8

5

Solved

Blätter werden gold und Rollen nach oben?????Was passiert hier Blätter Rollen sich nach oben und fangen an sich gold zu färben

Leaves. Other

5y ago

2

2

Solved

how to cure at harvest? 40th day in flower How should I do at harvest time? What kind of area should I dry my daughters in after harvesting, what temperature and humidity should I have, how many days should I hang them and how many days should I keep the jar, how many minutes or how many hours should I ventilate the jar

Leaves. Other

3y ago

4

4

Solved

What is this?I am confused.

Leaves. Other

3y ago

1

4

Solved

Hanging leafs getting worst Looks like the leafs are getting more in hanging mode A few big leafs are getting crispy Is the plant now offical dead or on its way ? 🤔

Leaves. Other

5y ago

6

4

Solved

Young plant. Spots?Young plants. Only 5 nodes. Please see pic. Any help would be great. Lower leaves and starting at tips. Same issue 2 separate plants. First time in coco. Calcium maybe?Thanks

Leaves. Other

3y ago

4

4

Solved

Bugs or no Do new cannabis leaves sometimes have defects or missing pieces? Mine seem to have a few missing spots and I’m wondering if it’s bugs or something to keep an eye on?

Leaves. Other

Other. Bugs

5y ago

1

1

Solved

Leaf diagnosis required green love potion almost a full 5wks into flower and today I noticed some rusty spots on a few fan leaves as well as purpling at the tips. The only leaves affected so far are the one pictured and they are near the bottom of the main cola, is this anything to worry about?

Leaves. Color - Dark-purple

Leaves. Other

4y ago

5

3

Solved

Should I remove the fan leaves when it's flowering?Should I cut the fan leaves when it's flowering? Or is it bad

Leaves. Other

5y ago

1

4

Solved

Hole on leaf, aphids, and solution to apply during flowering ?Hello, I want to know if the hole on my plant is due of aphid ? What should I do to protect the plant and kill them all ? I can make a preparation with soap, garlic, oil, and water ? It can be bad during flowering ? Thanks

Leaves. Other

5y ago

1

1

Solved

leaves don't seem to be that strong The leaves don't seem to be that strong, I'm on week 7 in Veg, help me check out my problem. This is my first planting

Leaves. Other

4y ago

2

5

Solved

Fungus?Hi, whatever is on the leaves seems to be spreading. I tried not watering it for a few days like advised but it’s getting worse. Any ideas?

Leaves. Other

6y ago

1

1

Solved

Basically im seeing some deficiencies on plant number #1. It can be calmag but not too sure! Ive also been using filtered reverse osmosis water, which ive heard can cause deficiencies. Im thinking i might have boron deficiencies on my plants by the way it looks. Can someone help

Leaves. Other

7y ago

6

4

Solved

Stunted not growing Hello, I’ve been having a tough time trying to decipher what’s going with these two plants. I thought I was overwatering them so I backed off some but no change. Only given 1/4 and 1/2 doses of nutrients. Ph is been 6.3 They just seem to quit growing past couple days. Thanks

Leaves. Other

3y ago

3

6

Solved

1st time grower need advice and need to make sure my plants doing good.My plant strain is blue dream fast photoperiod by seedsman. I use foxfarm soil foxfarm nutrients and my ph stays between 6.5 - 6.8. my humidity is 36-40 percent. My temp is 65-70 F. I run a marshydro ts- 600 led. My grow is 2 1/2 weeks into flower.

Leaves. Curl down

Leaves. Other

2y ago

2

1

Solved

fan leaves with brown spots and cristpy: Autoflower WW in week 4 My CKS WW autos started developing brown spots on the fan leaves about a week ago and they eventually turn crispy and curl. I'm growing in DWC w/ GH Flora Trio+CalMag+Hydroguard. pH 5.8-6.0, EC 1500, res temp 70 (was as high as 74).

Leaves. Other

5y ago

1

2