The Grow Awards 2026 🏆
Start My Diary
Start My Diary
Login
Start My Diary
Home
Diaries
Strains
Shorts
Questions
Contests
Growers
Seeds
Breeders
Nutrients
Equipment
Blog
Login
Sign Up
Following
Follow
Brands
&
Growers
to get updates
Back to Grow Questions
Heat stress or calmag?...or neither?
Meksi2790
started grow question 5y ago
not sure if this plant doesnt like the light maybe its too close does sort of look like calmag too but all other plants are great and loving it
Open
Week 5
Leaves. Curl up
likes
Answer
greenthumbartisan
answered grow question 5y ago
Kind of looks like it could be both light stress and calcium issue.
1 like
Complain
Similar Grow Questions
Solved
Ame_Mizu
Early harvest
Sollte ich lieber früher ernten bevor mir die blüten durch den Nährstoffbrand drauf gehen ? Ich gehe von einen Stickstoff brand aus habe auch einmal gespült Besserung ist aber nicht wirklich in Sicht.
Leaves. Edges burnt
Leaves. Tips - Burnt
Leaves. Curl up
6mo ago
2
2
Solved
Dankbudz84
Leaves curl on upper new growth and mid but not lower.
I’m using the canna coco line except boost, looks like phosphorus deficiency. I just lowered my a and b 0.7 ec and added 0.3 of pk for a total of 1.0. Is this phosphorus deficiency and do you think my changes will help. Leaves are a little dark shinny and the shape is odd.
Leaves. Curl up
Leaves. Curl down
5y ago
1
Solved
XxBILLZAxX
Leaf Curling - Late Flower
Growers, Small issue. LOADS OF LEAF CURLING. I assumed it was nitrogen so I stopped all nitrogen for 3 weeks & no fix. Flushed with 20L of water thinking its possibly salt? Nope still got a curling problem. Any ideas why this is happening & is it a big issue with 3 weeks left?
Leaves. Curl up
Leaves. Curl down
5y ago
5
5
Solved
Harold_Halibut
Super Urgent, first time grower, batch might go to heaven - plants look beaten up, I suspect light stress or overwatering
5 plants, 4’x4’x6.5′ grow tent, 600 watt HPS lamp (it is hanging 70 cm above the highest canopy plant), did topping on 2 of them, swithing to fowering very soon, average humidity is 30%-50% (can't afford a humidifier now, so I use natural methods) for now), 2 static fans
Leaves. Tips - Burnt
Leaves. Curl up
Leaves. Curl down
13d ago
2
2
Solved
FeebleSnane
Starting to fade? Or nutrient deficiency?
One of my plants has several fan leaves that are turning yellow/purple, and I can't tell if it's low on N or starting to fade. The plants are 2 days into week 5 of flower with a 9-10 week flower period, so it seems a little early for it to be turning colors like this.
Week 9
Leaves. Curl up
Leaves. Color - Yellow
Leaves. Color - Dark-purple
8mo ago
4
Solved
Galarihno
New Leaves Twisting
Why are new leaves "twisting" like this? This started in early flowering stage. I have 3 other plants, but only this one have this issue. 19°C - 23°C 55% - 65% RH 6.3 PH 150W - 45 cm height
Leaves. Curl up
Leaves. Curl down
Leaves. Twisted
2y ago
1
1
Solved
PapaBaer
Zu viel Dünger?
Habe ich zu viel Dünger verwendet oder sind die Blätter eine Nachwirkung vom Trimmen / Beschneiden hab heute mal alles was kein Licht bekommt abgemacht damit die Luft besser zirkulieren kann.
Leaves. Too many
Leaves. Curl up
Leaves. Curl down
6y ago
3
Solved
Eagers
Nitrogen toxicity?
This plant hasnt had any liquid nutes since been tranplanted 3 wks ago, i did however lightly foliar feed 0.5ml/l of bio-grow 1ml/l bio-heaven and 1ml/l cal-mag mixed with 1L spray bottle used over 1 week. My other plant looked deficient and bounced back. Could be anything else?
Leaves. Curl up
Leaves. Curl down
6y ago
1
2
Solved
RieferSoutherland
What nutrient issue are we looking at?
Having issues with one of the Bum Wine. Any thoughts on what nute is out of whack?
Week 6
Leaves. Edges burnt
Leaves. Curl up
Leaves. Color - Mottling
5y ago
2
2
Solved
MMSC16
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)
Week 7
Leaves. Curl up
Leaves. Color - Pale
2y ago
3
4
Solved
RaS_Audio
I think my plants are suffering a Phosphorus deficiency due to lockout due to low ph of soil. My first flush only helped for a while. As soon as the medium gets too dry damage resumes. I went to check on them yesterday and the amount of damage they took in 24 hours was pretty bad
Week 6
Leaves. Tips - Die
Leaves. Curl up
Leaves. Color - Dark-brown
5y ago
3
5
Solved
ChuckyBB
Leaves Curling
i notice today a couple of my leave are curling up and an sure there shrinking, is this normal guys.. Thanks
Leaves. Curl up
5y ago
1
1
Solved
pendeja420
Everything seems to be OK except one thing (week 3). I thought using the greenhouses at night made this, but it doesn't. When I check the plants early in the morning, their leaves are slightly curled upwards, just along the edges. As the hours go by the leaves flatten. Any clue?
Week 3
Leaves. Curl up
6y ago
1
3
Solved
Calzini1
Curled up leaves on day 7
I started a plant ten days ago and from the 7th day some leaves started curling upwards. I flushed the soil one day before planting the sprout and watered it again on day 9. I use the Fecida 600 lamp 16/8 day/night. Does someone know what could cause the curling of the leaves?
Leaves. Curl up
2y ago
1
Solved
Creenpie
Yellow brown spotted Leaves
Hi. The first Sweet ZZ auto. Second NL auto. PH water before watering 7.0. Whats wrong with these both? Thx.
Leaves. Edges burnt
Leaves. Curl up
Leaves. Color - Yellow
4y ago
1
1
Solved
Weeweeh
Need help
Watered with fertilizer between day 28/29 After that : - some Leaf pointing upwards , twisted - some Leaf pointing down , twisted - Plants will not stretch , are bushi - yellow leaves Photo are from day 28/29/29/29/30 , created my gw today ask me if you need more infos
Leaves. Curl up
Leaves. Curl down
Setup. Strain - Autoflowering
2y ago
6
Solved
pinkdragon
Just to confirm, this looks like nute burn, doesn't it?
Burnt edges, tips curled up, canoeing. I've been having trouble balancing airflow and heat in such a small tent, and as a result the tent is on average about 28 degrees celcius daytime and the plants still get a lot of wind. Looking for whatever advice you can give! :)
Week 8
Leaves. Edges burnt
Leaves. Curl up
Leaves. Color - Mottling
5y ago
3
3
Solved
SnowBuds
Tips yellowing
is this light burn/stress or Defiency? New growth seems to be lighter green than the rest. Ph is 6.0 Ppm is 580ish (slurry) Light was 11inches away from canopy of tallest plant and 12-13inches from other. Soil is not over watered. Temp is between 68- 72 degrees. Humidity %50
Week 6
Leaves. Tips - Burnt
Leaves. Curl up
Feeding. Deficiences
5y ago
1
2
Solved
420Highlifecouple
Wtf?PLEASE HELP GUYS!
Please help guys,whats going on with my lady?
Leaves. Curl up
3y ago
5
Solved
NeptunesTerps
Weird Curls and Holes
Okaaayyy so wtf 😂 I've altered light intensity and height multiple times at this point. I've ruled out pests. I think it's either windburn, heat, light, or a combination of all 3. It's a little concerning seeing as how I think mid flower is right around the corner 😓
Leaves. Curl up
9mo ago
4
3