The Grow Awards 2026 🏆 
Calcium/magnesium
Tweakanswered grow question 5y ago
What is your growing medium? If you’re growing in soil I highly doubt it’s a cal/mag issue as there is plenty of cal/mag for a grow in most quality soils, more likely you’re Experiencing pH fluctuations in your medium.
sir_isOanswered grow question 5y ago
Vague, though I would probably use calmag...but then, I'd probably also add a bit of sulphur and phosphorus if I have some.
1 like
Complain
OrganicNature420answered grow question 5y ago
1.0 ml of calmag per 1lt will do it wonders for next week or 2. Then start lowering it 👍🏻🌱❤️🍁
1 like
Complain
Similar Grow Questions
Solved
SweetJB
I've been seeing old fan leaves and the bottom canopy turn yellow. And the Pineapple Express is not looking as Green as the other.Hello! I've been noticing the blue dream fan leaves are tuning yellow. Also some new leaves hace a lighter green on the Edge of the leaves. Also the Pineapple Express is showing a pale green if you compare them. pH is 6, and I last watered with a quarter of what canna recommends6y ago
2
2
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
TopNotchBud
Whats wrong with her?I cant tell what's wrong with her. I recently upped my CalMag nutrients cause I originally thought this was a Calcium deficiency (full nutrient breakdown in diary). I dont want to hinder my harvest so any insight?Leaves. Color - Dark-brown
Feeding. Deficiences
5y ago
2
2
Solved
BobtheBUDbuilder
Whats going on?So.. 6th week into it. My leaves have various brown spots and yellowing spots in no particular spot. There is some browning on leaf edges. Also tips are up. I am thinking cal mag and to much heat. But not sure. I lifted light up and so far nothing. Also started adding cal mag .Week 6
Feeding. Deficiences
3y ago
2
3
Solved
Sup3rNov4
PH all kinds of fucked up!Urgent update. So it turns out the issues all alone where the soil ph which after testing it was PH 3.2 😳
I have flushed with ph 6.8 water and then added some epson salts bringing the final ph back to 5.6-6.2. I then topped the pot with new fresh compost. Will she survive?Week 9
Feeding. Deficiences
4y ago
2
2
Solved
buddhi_coop
Leaves yellowingThese leaves are stressing me out. I’m not sure if I’m having a lockout or if I’m not feeding enough phosphorous. Either way, I’ve been using 3 ml/gal of tiger bloom, 3 ml/gal formulex, 3 ml/gal big bud & 1tbsp of molasses for feeding. What do I do ?Leaves. Color - Yellow
Leaves. Other
Feeding. Deficiences
5y ago
3
3
Solved
DoubleDsTrees
What deficiency do you think this is? K or Mg?What deficiency do you think this is? K or Mg?Week 7
Feeding. Deficiences
3y ago
4
Solved
KisukeUrahara
Defficiency? 1st growI’m unsure of what is wrong with my plants. Leaves are turning yellowish colour and withering, first affecting old growth in week2F autoflower genetics.
I use ph 6.4 water, runoff measured at 6.0.Leaves. Curl down
Leaves. Color - Yellow
Feeding. Deficiences
5y ago
8
13
Solved
Splifranger
Overwattering ? Yellow leaves and hanging a bitIs she getting to much water ? I give water every 2-3days and just fil it til it runs out at the bottom to moisten every bit of soil. Yellow leaves at lower half cutted them al out and leaves are hanging bit. What should i do or is everything stil fine.Soil doenst feel to wetLeaves. Color - Yellow
Feeding. Deficiences
4y ago
2
2
Solved
Drizzy315
6 week flowering leaves turning black/ purplish color?Hey guys I’m new to the site and fairly new at growing got a question. My plant seems pretty healthy for most part but recently what appears to be black color taking over the leaves ? Is it phosphorus? I been giving them plenty bloom nutes. It week 6 about. Any idea what it can bLeaves. Color - Dark-purple
Leaves. Color - Dark-brown
Feeding. Deficiences
6y ago
2
Solved
Lanchita
Deficiency of nitrogenW.Gelato seems its taking too much nitrogen. Ive already made top dressing with worm castings and compost teas but still hungry. My question is: should i add some small dose of NPK mineral based (i have PLAGRON coco A+b) or it would do more bad than good since im doing organicWeek 4
Feeding. Deficiences
5y ago
1
1
Solved
Gertrude
Substances shortageDo you think there is any shortage of substances? what do you recommend?Week 6
Feeding. Deficiences
6y ago
1
1
Solved
torquesan
Need some help asapWhat is wrong with her? :( I am assuming N Deficient, but I also have veeeeeeerryyyy lightly burnt tips so it is confusing to me. The lime-greening of the leaves makes me think N Deficient though.. Any thoughts? I have some new nutes on the way should be getting here tonight too.Leaves. Tips - Burnt
Leaves. Color - Yellow
Feeding. Deficiences
4y ago
3
5
Solved
CroqueMonsieur
Yellowing leave tips and clawing down, do I need to start giving more nutrients?Hello all, I'm experiencing some yellowing leave tips on newer growth, it is paired with some light clawing (downside) on the newest leaves (only on the green gelato). I have used very little nutrients so far and have fertigated only once in fear of giving too much.5y ago
1
2
Solved
BudKiefer
Was rocking then came issues YELLOW LEAVESI am starting to see yellow veins or purple veins yellow leaves and tips. Is this Ocean Forrest plus California Super Soil short nutrients? Am I seeing MG deficiencies, potassium deficiency, over water.... you know the typical 1st grow issues. How to correct?Week 5
Feeding. Deficiences
4y ago
1
1
Solved
Lol_You_Looked
Spotting and discolorationHydro set up, put a humidifier in the cabinet with the plant, and started noticing this after a few days. Any ideas as to what is going on with this spotting and discoloration?Leaves. Tips - Burnt
Leaves. Veins - yellow between
Feeding. Deficiences
3y ago
1
1