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2020Growerstarted grow question 6y ago

Anyone know why the tops of my plants are yellowing? Last 2 feeds fed 5-6ml cal mag 2 ml flora nova grow, etc. in coco, 8th week veg, under gavita led @ 65% output.

2020Grower

2020Grower

2020Grower

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Leaves. Color - Yellow

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StayWeededanswered grow question 6y ago

If you’re using any kind of synthetic nutrients, then yes, you should be checking runoff. You won’t always have to, especially when plants look healthy, but if you have some deficiencies, checking your runoff will let you know if the pH is in a good range or if you have a lockout. If pH is good, you take care of the deficiency. If pH is out of wack, you need to flush and get your pH back into a range where the plant can uptake nutrients. I do Organics so I haven’t checked any of this in a while but for coco, I believe you want your pH to be somewhere between 5.5-6.5

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2020Groweranswered grow question 6y ago

I am going to water today I will check ph and get back to you. Appreciate your knowledge brother

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ChitownCannaChicaanswered grow question 6y ago

Also check your light distance... too close can cause this burn/mag deficiency

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2020Groweranswered grow question 6y ago

Should I check my runoff ph? What should it be?

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StayWeededanswered grow question 6y ago

The yellowing between veins and purpling on the stems and petioles looks like a mag deficiency. If you’ve been feeding cal mag, then I’d try checking your pH next. If pH is fine and there is no lockout, you can do an Epsom salt foliar.

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