The Grow Awards 2026 🏆 
Dark spots on fan leaves
CountDoobiestarted grow question 1mo ago
The fan leaves of the 2nd & 3th node have developed dark spots on the leave.
What is this? and what is best to do?
likes
Answer
JUNGLE_B4RNSanswered grow question 1mo ago
This is nutrients burns.
Your problem is "wrong plant size in wrong pot size". Pouring small amounts of water and getting no drain, NaCl is building up.
Give your plants a good watering to get some drainage and everything will be alright.
2 likes
Complain
AestheticGenetixanswered grow question 1mo ago
Dechlorinate your water or boil and cool it.
Looks to be chlorine toxicity to me.
But the other option would be calcium magnesium deficiency/issues.
2 likes
Complain
HinduGodanswered grow question 1mo ago
LOOKS LIKE DAT COULD BE A FUNGAL ISSUE!!! HAVE YOU SPRAYED DAT PLANT WITH ANYTHING!!! SOMETIMES DAT CAN BE VERY VERY BAD!!!!!
2 likes
Complain
DrGruenanswered grow question 1mo ago
hi ......
das sieht mir nach Cal.-Mag Mangel aus.........Könnte allerdings auch eine Überdüngung sein......
würde Cal Mag nach Düngeschema des Herstellers giessen und die anderen Dünger weglassen.
Nach ein paar Tagen, siehst du ja woran es liegt und kannst dich genau darauf einstellen.
Viel Glück
1 like
Complain
Similar Grow Questions
Solved
DrJoint
PH issue ?Hi guys! Could you please advise what is the problem with my Chempie and how to deal with this issue ?Leaves. Color - Dark-brown
Leaves. Color - Black or grey
Plant. Stem - Red or purple
5y ago
3
2
Solved
m1kax
leaves brown stainsis my 1st time growing weed.
my plants start get this brown stains on top leaves 2 weeks ago;
i check ph was 5.95; so i think this could be calcium, because internet say they cant absorb calcium;
i have high humidity before the stains appear like 80% but was only 4 or 5 days.Leaves. Color - Yellow
Leaves. Color - Dark-brown
Leaves. Color - Black or grey
2y ago
2
4
Solved
ZhugeTsuki
Still cant figure out what's going on with this plant. EC was over 2 for a couple of days but has since been taken care of, last reading was .83.Is this a deficiency or some other kind of issue?
Some have suggested a p or k deficiency, but I feed Jack's 20-10-20 peat-lite so I would be very surprised if it was a P problem, and the problem seems to be all over the leaves, but a lot of them start from the base of the leaf.Leaves. Color - Black or grey
Other. Mold
6y ago
3
Solved
Kaiserschmarn
My seedling doesn't look so good.This is my first coco grow so could be possible that I made a mistake. The other three seedlings are super healthy but this one has this weird thing with it's leaves. Somebody seen this before?
I gave them some root juice and fertilizer before transplanting with ph between 5,5-6.Leaves. Color - Black or grey
5y ago
2
3
Solved
HomeGrowBro
Late flowering damaged leavesHi. Should I be worried? What action must I take. I dont want to spoil this grow. ThanksWeek 15
Leaves. Color - Black or grey
4y ago
1
3
Solved
Cauli
Leafs on top turning slightly yellow and getting black spotsHi fellow growers,
any idea on what's happening to this plants?
All three pictures are different plants and it is spreading super fast. One plant in tent doesn't show any of the symptoms.
I already flushed them and gave them a light nutrient solution with PH 6,2Leaves. Color - Black or grey
10mo ago
4
5
Solved
ButtersStotch
Leaf DeficiencyWhat deficiency do you think this is?Week 10
Leaves. Color - Black or grey
6y ago
4
4
Solved
baddawgLLL
a black spotSuddenly, a very small black spot appeared on the leaves of the plant, very, very small.
help！Leaves. Color - Black or grey
4y ago
3
3
Solved
PlanTings
Black LeafDoes anyone know what's this? I just transplanted it, yesterday, and one of the leaves is getting black and smaller.Leaves. Color - Black or grey
5y ago
3
2
Solved
Chilipadi
Grey spots appearing on both sides of leaves on this seedling. Already receiving light feed grow+calmag. What could this be?Leaves. Color - Black or grey
5y ago
2
2
Solved
Zegr8
Leaves burnHi! Is this nutes burn? Damage is on the upper/middle part of the canopy on very few leaves, but many more have black tips.
I’m puzzled because during veg I was feeding the plant higher ppm than now and never had a problem!Leaves. Edges burnt
Leaves. Tips - Burnt
Leaves. Color - Black or grey
5y ago
2
Solved
Indica_Jones
Purpel oder mengel ?Prupeln meine Goriilla Zkittlez oder ist das ein Mangel oder Problem ?Leaves. Color - Dark-purple
Leaves. Color - Dark-brown
Leaves. Color - Black or grey
5y ago
2
2
Solved
Smokeyboar
leaf problem what would it be cheersLeaf problemLeaves. Color - Black or grey
5y ago
1
2
Solved
Aragon
Dark spot on the leaves of my seedlingHello, i have a weird dark spot on my seedlings idk what it is and if i should be worried. I know on these genetics the leaves can turn dark purple but I don't think it would be happening this early. I fed them nutes for the first time yesterday and today this dark spot appeared.Week 3
Leaves. Color - Black or grey
5y ago
2
2
Solved
The_Wanderer
Cold or hot extraction for antioxidants?What preserves anthocyanins in our cannabis leaves better? If we want the antioxidant properties so we can use them for our benefit, which is better? Cold gentle extraction or use of heat? A traditional african practice centuries old makes tea from leaves to treat certain illnessLeaves. Color - Black or grey
2mo ago
4
3