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Couple questions about treating the magnesium deficiency: Did you foliar spray or add to regular nutrient mix? How much are you using per gallon? And how often are you applying? Congrats on finding a solution.

Hey Mick, Apologies for resurrecting an old thread, but I was wondering when you started counting veg days. About how many days from sprout do you start the count? Really appreciate all your info.

You still haven’t tried the epsom salt foliar spray? I don’t understand; how could it hurt? 1 tsp per gallon once a week at lights-out cleared it up for me in two applications. Don’t forget to spray the undersides of the leaves.

You might want to hit them with an epsom salt foliar spray. The interveinal yellowing and purple stems looks a lot like the magnesium deficiency I just had. Epsom salts cleared it right up (1 tsp per gallon sprayed just before lights-out). Might be other things that can cause that but it looks...

I would. I posted in another thread of yours about it. I really don’t think it would hurt to try if you’re still seeing that interveinal yellowing. 1 tsp per gallon. I sprayed just before lights-out and made sure to get the undersides of the leaves as well. I’d bet it’s a magnesium deficiency.

Did you try the epsom salt foliar spray? Updated photo?

I’m currently growing Northern Lights feminized (bulk/white label seeds from North Atlantic Seed Company). I had that same interveinal yellowing (see photo) in early veg. I diagnosed it as a magnesium deficiency and treated it with epsom salt foliar spray (1 tsp per gallon). I sprayed twice, one...

Hi there. I have 4 GDP plants flowering in a tent (second grow, first tent grow). They’re on day 72 since the flip. About a week ago I noticed the upper fan leaves on one of the plants yellowing from the base of the leaf moving toward the tips. There are also brown spots within the yellow...