Shayne010944 said:

Hi all,

So I’m entering week 6 of flower today and have noticed top leaves very deep green , slight leaf tip burn ( very slight )

Last couple weeks I raised my nutrients up to 1.8ec so about 900 ppm I think it is.

Decided to check run off today and wow it was 2.4 Ec.

Why has it risen so high ?

I decided to flush with straight ph water and will go back to nutes tomorrow only at half strength.

I am hand watering at once per day when lights turn on .

Humidity is 65% high and %45 low

I can’t seem to keep it down when the lights on .

Also did notice the top cola leaves are starting to curl up. I was thinking this is due to the heat and too much nutes ?

Will my flush fix this ? I’m also curious to why it raised up so much

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Arkos said:

Is the plant as close to the light as it looks on the pic ? If so move the light further away, that's what it looks like to me anyway.

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Treetrunks said:

Have you been measuring your run off throughout the grow? It's pretty common for run off to be a slightly higher e.c. then the feed your watering with

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Frankster said:

Aqua might see this or others might say better than I, but I go by what the plants are telling me. If it was me, I'd look at the symptoms, and also that your getting well into flowering. I would give her a good flush, I use a surfactant, like yukka extract for the root zone, then reapply your appropriate nutes, and maybe inoculate it with a bit of extra micros, if you've got them.

That would be my advice, give it a decent flush. Did you check the pH of the runoff?

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Shayne010944 said:

Nah I didn’t check the ph on the run off . I figured I can’t change the ph ?

Really only do ph going in at 6.1 / 6.2
I’m growing in coco also

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Frankster said:

Well as the salt's accumulate over time, the ph can drop, because the EC is becoming more concentrated. Likewise, if you've got good/excessive nitrification, the pH can actually be elevated, which I think is usually the more common issue that can occur at your stage, so that's why I asked. It would simply add another layer to what we know already. Therapy could be guided by that information, but it's not critical.

I would give a good flush, and go with that. Also, backing off the light a few inches might be beneficial, until you rebound.
That's my advice, and I'm sticking too it. (unless someone more experienced comes along, and tells me I'm full of shit.).

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Shayne010944 said:

Yeah it’s pretty damn close now

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Shayne010944 said:

Last couple weeks I raised my nutrients up to 1.8ec so about 900 ppm I think it is.

Decided to check run off today and wow it was 2.4 Ec.

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Arkos said:

And the light can't be moved up ?
Bend the tops down if so.


Seeing your runoff ec is 1.8 I'm pretty sure the light is at fault.

What's the recommended hanging height for flowering ?

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TheBadChoice said:

A lot of LEDs dont produce a lot of heat so you can get closer

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Dirtbag said:

Nutrients build up, it happens. Especially if you are feeding more than they need.
Typically I monitor runoff in DTW every day or so to see where it's at. Especially in flower as the plants eating habits can change and you often will see buildup in the first few weeks, especially in stuff like peat mixes but it can happen in any media.

If the runoff is coming out slightly hot, like up to 2ec, I'll just feed lower for several days to bring it down. But if I see it go over 2ec I bring it back down with a rinse until I'm back to target runoff ec of around 1.5-1.6 in my garden.

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