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Old 07-26-2020, 10:08 PM #1
ilovesluts420
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Stems are turning purple during week 3 of flower

I’m running the Gavita 1700e’s. I had some problems early on in the veg stage with purple stems but now it’s coming back during week 3 flower. Are the lights too strong? They’re at 70% right now. I am slowly bumping up the brightness by 5% a week. Maybe I need more cal mag or nitrogen? Or both?
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Old 07-29-2020, 12:45 PM #2
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Purple stem are often du by a lack of mag. Go and buy a bag of epsom salt at drug store and add 1/2 to 1 teaspoon by 5 gal of solution.
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Old 07-29-2020, 07:14 PM #3
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Purple stem are often du by a lack of mag. Go and buy a bag of epsom salt at drug store and add 1/2 to 1 teaspoon by 5 gal of solution.
Hmm epsom salt? What about if I just used extra cal mag?
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Old 07-31-2020, 02:18 AM #4
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Quote:
Originally Posted by ilovesluts420 View Post
I’m running the Gavita 1700e’s. I had some problems early on in the veg stage with purple stems but now it’s coming back during week 3 flower. Are the lights too strong? They’re at 70% right now. I am slowly bumping up the brightness by 5% a week. Maybe I need more cal mag or nitrogen? Or both?
I think you're probably on the right track. A lot of LED users are finding these type of results, and I have a feeling it's something we'll all have to dial to our specific conditions, until someone figures out a formula for how much nutrients plants need in which stage of life, and at what light intensity.

If you're slowly bumping up light intensity, but keeping the same feed level, that might explain the eventual deficiencies you're seeing.
For efficiency sake, you could try turning the light back down slightly, and see if they grow at a better rate, with more even greening. Or you could bump the feed up with the lights, and see if they green up, and grow faster.

I'm going through this fine tuning myself, and wondering how a lower light intensity and feed level will compare to higher levels of both.

I just use Megacrop, pH down, and pool shock, to see how simple I can get away with.

I used to feed the MC at 4 grams per gallon, but I was still getting purple striping and leaf stems here and there, and other signs of deficiency, so I bumped the feed to 5g/gal, and they started looking better.

Well, I bumped the lights up, and eventually they started looking like they were lacking again.

Now the lights are back down, and I'm watching to see how they react.

I've been stubborn, and trying not to add Epsom, but I finally did in a spray bottle, just to try spot spraying a couple particular hungry looking plants. I've only done it recently though, and don't have results for you yet, sorry.

If I don't get satisfactory coloring or smells in the final buds though, I'll probably start adding it to the rez.

Anyway, you could try adding a little of any or all of the suggested nutrients, or you could try turning the light down a little, and see how they react.

Oh, right, you're in the 3rd week of flower... You might not want to bump the food up too high, for too long if you do. They won't want as much of it in a few weeks.
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Old 07-31-2020, 03:22 PM #5
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Originally Posted by ilovesluts420 View Post
Hmm epsom salt? What about if I just used extra cal mag?
Purple steam are magnesium def. not a cacium def. so why add more cal ?
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Old 07-31-2020, 11:10 PM #6
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Purple steam are magnesium def. not a cacium def. so why add more cal ?
I thought cal mag had calcium AND magnesium
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Old 07-31-2020, 11:15 PM #7
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I thought cal mag had calcium AND magnesium

I think he thinks you only need magnesium, which is why he's just recommending the Epsom salts. No sense adding extra calcium if you don't need it. Plus the Epsom would give you a little extra sulphur, for the funky smells... Just my guess though.
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Old 07-31-2020, 11:54 PM #8
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I think he thinks you only need magnesium, which is why he's just recommending the Epsom salts. No sense adding extra calcium if you don't need it. Plus the Epsom would give you a little extra sulphur, for the funky smells... Just my guess though.
I see. So adding epsom salt is a common practice? Never heard of it. So it’s recommended by others? Not saying I don’t trust the fine gentleman who recommended it just would like others to tap in. Anyone else have experience with epsom salt?
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Old 08-01-2020, 01:27 AM #9
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Oh yeah, Epsom salts are a common additive. I think the usual dilution is 1tsp/gallon, whether as a foliar spray or in feed water. I'm new to it though, so if other Epsom users have an opinion, chime in. I don't wanna over dose his plants or anything.
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Old 08-01-2020, 01:54 AM #10
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This can also be from the strain genetics.......which often it is. If the overall leaves look healthy, other than the porple stem- it's probably not going to be an issue
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