What's wrong? (Yellow and black leaves)

cjohansenMarch 20, 2014

I have lots of seedlings growing under CFLs, much like I did last year. 2013 was my first year, and things went pretty smooth. Now my seedlings are under-developed, some have yellow leaves, some have black leaves, and a few look entirely stunted and have even started dropping leaves. I have no idea what's wrong. I'm pretty confident I don't overwater, and I also don't think I am underwatering. The CFLs are 30w, and don't give off too much heat. Could they be cooking anyway? Any other suggestions?

This one is quite healthy:

My setup:

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If those were my plants, my first thought would be that they are severely undernourished.

Doesn't look like a heat issue, but put a thermometer in there to be sure.

    Bookmark   March 20, 2014 at 2:10PM
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Can't remember if it's lack of P or K. Research it a bit and come back and remind me...lol


    Bookmark   March 20, 2014 at 2:40PM
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Thanks, I'll try to hit them lightly with fertilizer. I'm using the same kind of soil as last year, and didn't fertilize until June or something, so it's a bit of a surprise, but worth a shot, for sure.

    Bookmark   March 20, 2014 at 5:10PM
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seysonn(8a WA/HZ 1)

I have had EXACT the same problem with my peppers. Now they are getting better. I call it "PURPLE" not black.

Anyway, I increased the fertilized and kept the lights farther away and shortened the hours. Now no more purple but some are still yellow. I don't want to push them right now because I don't want them to grow too big, inside. Once planted out, I can take care of them, I know how.

Here is a picture of mine about 5 weeks ago

    Bookmark   March 20, 2014 at 5:17PM
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The dark color is pretty common with pepper seedlings. I think it has to do with the artificial light. I have several that are exhibiting the purple coloring on leaves. I don't think it is signaling any real problems and unless the pepper is of a variety where the dark coloring is natural, I think it will clear up soon after getting outside in the real sun. I dont think any of those peppers pictured above look bad at all, maybe a little leggy, but that is it. I wouldn't be worried.

    Bookmark   March 20, 2014 at 11:59PM
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seysonn(8a WA/HZ 1)

I think you are right , Bruce.
Not all my seedling were affected that way. Bu they were all treated almost the same way. The one in the picture ( a Thai Chili) was the most severe case.
It is possible that different peppers have different light or cold sensitivity.

    Bookmark   March 21, 2014 at 2:22AM
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