Cal Mag feeding

[Tony.highgrows]

Hello everyone! I’m a new grower and new to the community! I’m hoping for some help.

I’m growing in ocean forest soil and using RO water. I know I need to use Cal Mag but not sure when I should stop feeding. I’ve recently flushed my plants to get ready for harvest but I believe it started to show signs of calcium deficiency.

Question: Should I stop using Cal mag two weeks before harvest or should I use it all the way till harvesting?

[mrgrowit]

Difficult to tell you for sure since we don’t know how much is in your medium right now. Both calcium and magnesium are needed throughout the plants life; but if you have enough in the medium already then you could potentially cut it off 1-2 weeks before harvest. Any idea what the PPM is?

[rama777]

You could taper the calmag down to near zero by harvest but like Mr. G said, both are needed to at least some degree until the end.

if you truly believe you are getting Calcium deficiency and it isn’t from a lockout, I wouldn’t cut it out personally..

I believe flushing nutrients only makes good sense if you have some kind of excess. I have very little to back that up. Either way, if you ARE out of calcium, certainly no reason to be flushing it out specifically right? Imagine a plant that had zero nitrogen by harvest. Would it taste awesome? Perhaps, but not really because you’d be harvesting a dead plant 😉

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