Cal/mag

Can you use cal/mag during flowering ? Or can you use it only during watering ? Or during feedings ?
If only during watering ,how much and how often ?
Thank u

I've used it from start to finish. Others may differ.

Ok , so like how much and how often? None of this is really touched on (effectively) in any of my books !

Frankiedoodlepants said:

Ok , so like how much and how often? None of this is really touched on (effectively) in any of my books !

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Depends on what medium you're using, and how much Ca and Mg is in your main nutrient concoction. I run Jacks 321 so I don't ever add any cal/mag, even with using LED's.

For the sake of answering your question - If you're in a soilless medium, I'd say 2ML - 4ML per gallon is a good range, you can water in with your regular feedings.

Ok ...
So I used ocean forest with vermiculite and co co in bags with LEDS
Ratio 2bricks of coco:3gallons of ocean forest and a quarter of vermiculite.. drains decently, different stages . I also use RAW grow and RAW bloom. I know that I could and should have better yields .. older fan leaves become SUPER DRY( had same problem in prior grow without amending the soil.

I use a 50/50 soil perlite mix. My water has low calmag so I use 5ml per gal every feeding with no issues and good results. Got rid of my purple stems in 2 weeks.

Bottle direction is 3-5 ml per gal. Fyi.

I am running a 600w hps and 315 cmh so might be different for Led.

Absolutely, use during flower. Cal and mg are key flower nutes. Best to get it built up in veg and add until wk 6 or so of flower. Around 3 to 5 ml every other wk in veg and 3 ml every wk during flower. Careful in flower. Look for options that do not contain nitrogen. Most do!

Frankiedoodlepants said:

Can you use cal/mag during flowering ? Or can you use it only during watering ? Or during feedings ?
If only during watering ,how much and how often ?
Thank u

Click to expand...

its important to understand (Mg) is no nute ..not a food

its a mineral and depending on your grow method.. mostly needed at 12x12 or at early flower at best

only cause the plant has consumed any (Mg) in the soil anyways

good luck

R Burns said:

Absolutely, use during flower. Cal and mg are key flower nutes. Best to get it built up in veg and add until wk 6 or so of flower. Around 3 to 5 ml every other wk in veg and 3 ml every wk during flower. Careful in flower. Look for options that do not contain nitrogen. Most do!

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Can cal/mag be mixed in with my nutrients or do I have to do a separate water with just cal/mag?

Mix it in with the rest of your nutrients.