The Grow Awards 2026 🏆

Back to Grow Questions

Is this a calmag problem?

Slickchigdogstarted grow question 3mo ago

What problem do i have? Is it calmag? Help please. I grow in lightlix biobizz and with biobizz fertilizer

Slickchigdog

Solved

Leaves. Color - Black or grey

likes

Pi_growinganswered grow question 3mo ago

This is not just cal mag. How much watt led used How much cm from plant and how much %? Did you use 100% of shema on every watering?

1 like

Complain

Selected By The Grower

Similar Grow Questions

Solved

Deadly Leaves Start Week 9 … is this a Problem or normal?

Leaves. Color - Black or grey

1y ago

1

Solved

Leafs dying off yellow/dark brown/ black Leafs slowly went from yellowish to yellow green dark brown black not sure whats causing this im not measuring ph so that could be first step to solve i guess cal mag P deficiancy????? definitely had some light burn as MH fce 3000 goes to max when its on 80prc lesson learned

Leaves. Color - Yellow

Leaves. Color - Black or grey

Plant. Stem - Red or purple

3y ago

2

4

Solved

Late flowering damaged leaves Hi. Should I be worried? What action must I take. I dont want to spoil this grow. Thanks

Leaves. Color - Black or grey

4y ago

1

3

Solved

My dwarves are sick, issue with leaves Issues with my dwarves leaves, can you help me to identify them ?

Leaves. Color - Black or grey

4y ago

4

10

Solved

1st grow need help Don't know what went wrong.as i said first grow. Leafs are curling down and they have a dark green color on the tips.. I can see a little yellow also.. Should i worry?what can i so to fix it

Leaves. Curl down

Leaves. Color - Yellow

Leaves. Color - Black or grey

5y ago

3

4

Solved

Bud leaves turned black Top leaves turned brown overnight, That day I did come home to a disturbing temp off 31oC . It’s the black Mini leaves in buds that are worrying me more. lights came on accidentally for two hours so gave her 16hrs dark and back to 12/12 This may have contributed.

Leaves. Color - Black or grey

5y ago

1

Solved

Black discolouration on leaves Okay so the problems with the black spots continue only on one plant. I tried reducing nitrogen and increased calmag to 4ml/g. I defoliated the affected leaves and sprayed with baking soda mix. 3 days later they're appearing again. If I don't get this fixed soon im gonna lose her

Leaves. Color - Black or grey

5y ago

2

3

Solved

Black spots spreading // Need your help!Anyone got a clue what this dark spots could be? It started in a corner of the tent with 1 plant a few weeks ago and now it has spread to another. I suspect pH issues and a nutrient lockout bc of that. Not sure if its the same issue though..Could be an infection as well...

Leaves. Color - Dark-brown

Leaves. Color - Black or grey

2y ago

1

4

Solved

Black growth seedling One of my 10 day old purple punch seedlings has some black stuff on its new growth in the center. My older PP had it too and she’s big now and doesn’t have it anymore.Still is this anything to be concerned about?

Leaves. Color - Black or grey

6y ago

4

Solved

Hello guys! A have a big problem Hi there. Today while checking my lovely flowers i found this plant woth this kind of leaf. It has more than one leaf like this the same plant. Anyone has any idea

Leaves. Color - Black or grey

5y ago

2

2

Solved

What to do? → BF Runtz Auto - Day 42 - RH70, 80F in BioBizz Light Soil On my last post, I was advised I have N tox, so I watered w/o BioGrow, just BioBloom and it's gotten much worse. The runoff EC was 1.5 (watered with 0.8, runoff pH was okay), so I’m guessing it's salt buildup. I plan to flush when this watering dries out—any thoughts?

Buds. Not fattening

Leaves. Color - Yellow

Leaves. Color - Black or grey

1y ago

1

Solved

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

First time DWC, day 70, 3 weeks in flower. Nasty rusty spots appear on lower leaves. Is this CalMag or else? Please help understand and fix, thank you :)I'm using TA Tripart, current EC is 1.6 - ph 5.5-6.5. Everything was smooth until week 10. Two weeks ago I started adding Plagron Power Buds and Green Sensation. Yesterday added CalMag to see if it helps, but it doesnt seem to... She drinks a lot, ph mostly goes down, EC static

Leaves. Color - Dark-brown

Leaves. Color - Black or grey

Leaves. Other

10mo ago

8

6

Solved

Help! Black Weed!Help! Almost ready to harvest on the winter solstice. Black weed

Leaves. Color - Black or grey

17d ago

9

8

Solved

Is this sign of nutrient lockout? I have moved her to a bigger pot now, that said I’m worried I’ve been testing my PH wrong, I uploaded a pic (day 26) is she starving? Up til now I haven’t fed her anything but water

Leaves. Color - Black or grey

7y ago

2

2

Solved

First grow issues Anyone know if this plant is gonna make it or what’s going on? Three different plants, First grow, all seeds are going good but these. Pictures are kinda hard to see. First two pictures are one plant. 3rd picture is 2nd plant. 4th picture is the 3rd plant.

Leaves. Color - Black or grey

3y ago

5

Solved

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 illness

Leaves. Color - Black or grey

15d ago

4

3

Solved

Taches noires sur les feuilles Demande de confirmation de diagnostique: J'ai remarqué des taches noires aux extrémités des feuilles. Je pense qu'il s'agit d'une carence en phosphore? J'ai un peu tardé à nourrir ma plante. Dans mon dernier arrosage: Ph 6.5 EC : 1.8 Terra bloom, green sensation, pure zym. Merci

Leaves. Color - Black or grey

4y ago

1

1

Solved

Weed doctors to the rescue Day 44, fb auto, my happy girl developed those dark spots at the top... Is this a Calmag deficiency? Although I'm giving her calmag every feeding. I think there are also first burnt tips. I'm about to water her tonight, what should or should not give her? Thanks for your inputs🙏

Leaves. Tips - Burnt

Leaves. Color - Dark-brown

Leaves. Color - Black or grey

1y ago

3

5

Solved

What Deficiency?What deficiency does this plant have? I have 15 plants inside this tent, all get the same nutes, all look great but only this one has these grey marks on the lower leaves

Leaves. Color - Black or grey

5y ago

1

3