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

Grow QuestionsClassic N toxicity (:

Classic N toxicity (:

Medicannastarted grow question 5 years ago

Heyho :) since she has progressing leaf tip burn and curled tips which I'd almost certainly say is a nitrogen toxicity, would you recommend going down to 50% general strength or maybe leave out the grow supplement at all and just feed Bloom? Cheers guys :)

Solved

Leaves. Tips - Burnt

Leaves. Curl up

likes

Ttrichomeanswered grow question 5 years ago

I personally do not see nitrogen toxicity. Actually I believe ur going to hard on the bloom. Overloading ur plant with too much potassium to early.

1 like

Complain

Selected By The Grower

Shagrathanswered grow question 5 years ago

Hi there! I think that there is no nitrogen toxicity going on but something else. It does not look too bad yet 'cos most of the time if only tip of the leaves are "burned" it does not affect growth at all if you wont let it go any further than that. I think your flowering stretch is over and the plant is producing more buds now so it would be a good time to switch to bloom nutes now. Happy growing! 👌

likes

Complain

Similar Grow Questions

Solved

Brown, deformed leaves Can you tell me what causes this?

Leaves. Tips - Burnt

Leaves. Curl down

Leaves. Color - Mottling

a year ago

5

Solved

MendocinoGreeno

Deficiency or excess Hello colleagues,please advise me, what could it be? the tips of the leaves are sometimes lighter, and the holey leaves? I didn't find any pests in the tent. I use the AH set. Once a week I only rinse with water with enzymes. Can you think of anything?

Leaves. Tips - Burnt

a year ago

4

6

Solved

Overwater, Normal, Circadian Rhythm or Underwater?Water-stress drooping symptoms on 2 younger colas. Mature colas leaves are praying / perkier. Some leaves 'canoe-ing' despite temps around 70-74F. Soil is still moist from 1L water 25 hours ago (6.3PH). Will water in 8 hours, making 33 hour interval. Normal or Water Stress?

Leaves. Curl up

Leaves. Curl down

a year ago

7

7

Solved

Is it a magnesium deficiency Is it a magnesium deficiency?

Leaves. Tips - Burnt

Leaves. Veins - yellow between

a year ago

2

10

Solved

Leaf problems My leaves are getting yellow from the bottom, and some have burnt tips. It started when she is in flower. I often feed Powder Feeding from Green House. PK+ (NPK: 0-30-27) and Hybrids (NPK: 15-7-22) the PH is 6.5 They say this strain wont need much nutrients but can handle more

Leaves. Edges burnt

Leaves. Tips - Burnt

Leaves. Color - Yellow

a year ago

6

7

Solved

Yellow leaf with brown spots?Plant has only 1 leaf like this, and the opposite fan leaf appears normal. Another plant has a similar leaf like this but with less spots, and one yellow or bleach spot. But only 1 leaf on each plant. My latest diary entry has more info, any help appreciated.

Leaves. Tips - Burnt

Leaves. Curl down

Leaves. Color - Yellow

a year ago

6

5

Solved

What is your best advice for helping plants look great and not dried out on any edges?Brown edges got me down. I'm sure its just humidity. I've been adjusting the light. Could it be more? whats your best seasoned advice to keep those edges looking crispy... (Good) ? not in the wrong way!

Leaves. Tips - Burnt

a year ago

2

2

Solved

Leaves curl up inside Anyone knows what this means ? Maybe the lamp is too close and bright ?

Leaves. Curl up

a year ago

1

3

Solved

burnts tips Tips have little red dots. Hydrophonics 500 ppm 3rd week. tripart grow 1ml/l cal mag 0.5 ml per litre. watr temp 21C, box temp 20C hum 50% what can be the problem? thanks

Leaves. Tips - Burnt

a year ago

1

1

Solved

Heat Stress or Nutrient Deficiency?Is this heat stress or lack of nutrients? Fading leaves, 24 days from last dry organic amendment (Gaia Green 444, 284 and worm castings)Raised serrated edges of leaves on tallest cola tells me it's too hot despite temperature in range (79F max temp, 65% RH. 16" from Light)

Leaves. Curl up

Leaves. Color - Pale

a year ago

3

4

Solved

Leaves curl up/ no change of color Hi everyone, i got 3 plants and 1 of them has the problem that his leaves curl up without change of color, another plant has it a bit but not so much and the other is fine ( they are 9 days old ) i treated them all the same.anyone knows what it means and what i gotta do ?

Leaves. Curl up

a year ago

1

1

Solved

Help sick plants I was wondering is this nitrogen toxicity or overwatering ?

Leaves. Curl up

a year ago

2

6

Solved

Leaf burnt edges Hi, I'm a first-time grower. Is this a sign of nitrogen deficiency in my Mimosa seedling?Thanks

Leaves. Edges burnt

Leaves. Tips - Burnt

a year ago

3

2

Solved

leaves pointing up I moved my girls outdoors today. I watered her with plain pH water. I saw the leaves pointing up. I thought it was something good until I did some research and saw where it was caused by light stress. is this true? new grower. what happens if the soil is on the plant?

Leaves. Curl up

a year ago

3

7

Solved

Dealing with Nutrient Burn and Salt Build-Up I've observed salt build-up and nutrient burn in my plants recently. I've taken action by flushing and removing 60% of the affected leaves. Now, I'm considering whether to remove the remaining affected leaves and when to proceed with top dressing. Please advise.

Leaves. Tips - Burnt

a year ago

2

2

Solved

Curling and yellow leaves flower stage Hi, Since the temperature changed I see that the leaves are taking a different shape and colour, is this pure of the temperature change ? It is 2.5 week in flower stage. Min. Temp is 13 with humidity of 88 during the dark hours. During light it is 27 degrees and 50 humidity

Leaves. Curl up

Leaves. Color - Yellow

a year ago

7

Solved

Yellowing, curling tips?I'm in the middle of week seven and noticing significant yellowing, curling tips, especially on the top colas. Is this cause for concern and what could be causing? Feeding low-dose (1/4-1/2 tspn/gal) of dyna-gro bloom and the plant is growing in MG soil. I know, rookie mistake

Leaves. Edges burnt

Leaves. Curl up

Leaves. Color - Yellow

a year ago

2

2

Solved

'Claws' on tips just after flowering started. Previous answers help - it is a bit worse. I keep a perfect VPD. What should I do? Flower wouldnt f I'm confused. For the first 3w I used LED as instructed 30-40cm, I had ~43cm,100%dim, everything was fine. When the bloom started yellow claws appeared and still there, maybe a bit worse, with 53cm and 75%dim. Mostly on BPP, one more plant showed her claws today aswell. 😓

Leaves. Edges burnt

Leaves. Tips - Burnt

Setup. Lighting

a year ago

2

2

Solved

What should I do when curled up leaf tips?12 DLI. 80% Humidity. 25°C I already lowered to 11.5 DLI since I am growing 24h with automatic strain and also rised humidity to 90%. The bottom of the pot have 56mbar tension it's day 5 and I didn't watered since 8 days ago day before planting.

Leaves. Curl up

a year ago

8

4

Solved

Discolored, burnt and curled up tips on higher leaves Several symptoms, always on tips of higher leaves : they are discolored/burnt or burnt/curled up. LED @40cm (deemed 70% of 300W) and I just gave them the 2nd flowering feeding, 4 days after first one (pots were very light). I was planing to start compost tea... What should I do ?

Leaves. Tips - Burnt

Leaves. Curl up

Leaves. Color - Pale

a year ago

3

2