CalMag problems

Thirsty_Grower
Thirsty_Growerstarted grow question 4d ago
A couple of days after the first preventive dose of CalMag, signs of a CalMag deficiency appeared on the leaves (week 9). I can't figure out whether this happened BECAUSE of adding CalMag, or DESPITE it (meaning I was literally just a little late, but still prevented the issue) ?
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Week 12
Leaves. Color · Mottling
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DrGruen
DrGruenanswered grow question 4d ago
Me again 😁 I just saw that you have a pH value of 5.0...... I think that's the issue, and your plant can't properly utilize the nutrients because of it. Correct your pH value to 6.5, and I think your problems will be solved....... Good luck!
RasendeRollo92
RasendeRollo92answered grow question 2d ago
This is no CalMag issue, this is the beginning of a nute lock Which comes along with a secondary CalMag issue, caused by low PH in Your Soul… basically what happens is, That your plant is Dying from Hunger eventhough the table infront of her is Full of food… What you need to do is : Flush the Soil until you reach PH of ~6 in your Drain, don’t Feed her for around a week. It will Continue to Build those Symptoms for 1-2 weeks, but it will survive. Hope that helped 🤞🏽👊🍀
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DrGruen
DrGruenanswered grow question 4d ago
HI ..... To me, it still looks like a Cal deficiency....... Watering once obviously isn't enough......... I add Cal-Mag every time I water and usually stick to the manufacturer's feeding schedule. Do you have any feeding schedule, or do you do it by feel??? Give it a try and add Cal-Mag every time you water and watch closely to see if it improves. Good luck!
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therealgrowmie
therealgrowmieanswered grow question 4d ago
I’d say this happened despite the CalMag, not because of one normal preventative dose. Deficiency damage reflects what happened in the root zone several days earlier, so symptoms can still appear after you’ve corrected the cause. Damaged tissue also won’t turn green again — judge the treatment by whether new damage stops spreading. From the photo, though, I’m not completely convinced this is classic calcium deficiency. Calcium problems usually show more strongly on newer growth, while this looks like an older fan leaf with marginal/interveinal yellowing and necrotic patches — which can also point toward K/Mg availability or general late-flower uptake issues. I wouldn’t keep increasing CalMag blindly. Check root-zone pH, EC/salt buildup, watering habits and whether the damage is still progressing. If new leaves stay clean over the next few days, the dose probably did its job.
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