The Grow Awards 2026 🏆 
Light burn or nut deficiency?
AutoPotBubbastarted grow question 5y ago
Can anyone help me I'm unsure if I have light burn or if I have a defincey . I can only see a few leafs in the middle of the grow which have this. The the rest around the edges of the tent are which is what leads me to believe that is is light burn. Can any confirm this. Ty
Solved
Feeding. Deficiences
likes
Fruitgroweranswered grow question 5y ago
That's not light burn that's calcium defeciency. If you're using high powered led lights, this would make sense as the plants tend to use more calcium and magnesium under these type of lights 🌱👍
SirSmokeALot333answered grow question 5y ago
Looks like a cal deficiency. I had this problem too caused by too much P or wrong pH.
likes
Complain
Similar Grow Questions
Solved
Hilkes_Herbs
Calmag?! Or what is it?!?! It’s driving me madHey y‘all! 2 of my 4 plants are showing up some defiencies. I have no clue what it is because it SHOULD be missing CalMag but I‘m feeding CalMag also to prevent from exactly this defiency - what can i do to get this straight again? Ph 5.5; EC 1.8 (tap water has 0.6)6y ago
7
3
Solved
Bootymissles
What deficiency?What kind of deficiency on my newer growth?Week 7
Feeding. Deficiences
5y ago
7
7
Solved
AutoGOAT
HelpHi. So im using a soil(plagron batmix) which says i do not have to feed the plant for 6 weeks. I looked up a couple videos and they say that as an organic grower, i dont have to ph my water. But im still having some kind of deficiency. So what do i do? Thanks a lot!Feeding. Deficiences
4y ago
2
1
Solved
Jaxx_Teller
Brown Leaf Spots help!I have a serious problem with two of my girls and I can't figure out whats wrong.
The pics attached show the brown spots that have now spread to a good 60% of the leaves on each plant. I've defoliated as much of it as I can and its now affecting even the sugar leaves. Any ideas?5y ago
1
4
Solved
GrowmieDeLaStreet
Maintaining the soil pHI give pH'ed water, never more than 800ppm and I still always end up with lockouts. I used to not give water untill runoff but now I do. What to do after testing the runoff? It's currently at 6.0 even after a flush with 7.2. Ask many questions I need to know what I'm doing wrong.Other. General questions
Setup. Substrates
Feeding. Deficiences
4y ago
1
Solved
BettieBee
K deficiency almost wiped out this plant. What do I do now?I’m somewhere between 2-3 weeks until harvest time should be. It’s day 80 from seed on this autoflower. Had a bad potassium deficiency that I didn’t figure out quite in time and I’m not sure if too much damage has been done. What should I do?Week 12
Feeding. Deficiences
3y ago
4
4
Solved
GODSGIFT_2005
Potassium deficiency?Can someone pls. confirm that this is a potassium deficiency? I’m in the 6th week flower
I was very low on ppm feeding
It’s effecting the upper leaves mostly
Using LED 150w marshydro
It’s an organic grow.
Please let me know Thanks!Feeding. Deficiences
4y ago
1
1
Solved
Warzouz_grass
Problema con mi Runtz MuffinBuenos días,
Tengo un problema con mis hojas, (puse fotos para que podáis ver).
He visto que podía ser un deficiente de fósforo. Pero también puede ser un problema de calcio y de magnesio.
Alguno podría ayudarme con eso ? Que tengo que hacer ? Añadirle un PK 13-14 ?5y ago
3
3
Solved
PenguHB
Phosphorus deficiency?Sugar leaves turning pale/yellow(?) from leaf edges. Seems to only be happening on main colas. I suspect phosphorus deficiency. Beginning of week 4 of flowering, fast groweing auto (around 2 weeks left according to the breeder).
Please help me identify the issue.Feeding. Deficiences
4y ago
4
3
Solved
ZigkGrow
Spraying the leavesWhile I was checking my plant I saw these “black stains” like the plant is “half-bitten/scorched”.Is it possible to burn my leaves and create this effect after spraying them with nutes. Blacks spots were created today after I sprayed them and there were drops on leaves for hours5y ago
2
Solved
BavarianBarbarian
Nitrogen Toxicity?Not sure if this is nitrogen toxicity or normal leaf color. Crinkling was caused by too much light and the fan. Got better in 24h after adjusting grow light and fan. Plants are starting week 2 of veg, Hulkberry Auto. Medium is light mix soil.Leaves. Twisted
Plant. Other
Feeding. Deficiences
2y ago
4
3
Solved
AlpAge_Cino
yellow/brown spots on lower leavesHi, 2 of 8 got yellow/brown spots on lower leaves. I've watered them once a week and add calmag, pH=6,2 following b.a.c. instructions. Last watering, i forgot calmag so I did a second watering 5 days later with calmag. What could be the problem ?2y ago
2
2
Solved
aDriftwoodKing
Seedling yellow tipsOne of 4 seedlings has developed yellow tips. Leafs have been curled down since it sprouted. It's about a week old, FFOC soil w/Perlite, Mykos, 3 gal fabric pot. Have been watering until soil is damp using finger test, about a cup or 2 a day. Added 2 ml of silica boost yesterdayLeaves. Edges burnt
Leaves. Color - Yellow
Feeding. Deficiences
2y ago
1
1
Solved
Strangegarlic
Soil ph trending downwardKeep having problems with my soil ph. Using ocean forest just phed water thru veg and just started using GH floratio nutes a week ago. Runoff keeps trending downwards sitting at 6.1 now. Any long term solutions to keep it happy towards 6.5? Had this issue for a few weeks.Feeding. Deficiences
5mo ago
10
7
Solved
Reaper
2 problems with the hydro plant:
1: brown dots on LOWEST leaves
2: verical growing stems
please watch the pictures of day 23 to see the details. stems snap very easy at the nodes when i try to bend em outside (hydro plant). the soil plant doesnt snap. calmag ppm was 200Week 4
Feeding. Deficiences
6y ago
3
1
Solved
buddhi_coop
Yellow tips on new growthWhat do the yellow tips on new growth mean?Leaves. Color - Yellow
Leaves. Other
Feeding. Deficiences
4y ago
1
1