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What's wrong? (Yellow and black leaves)

Posted by cjohansen (My Page) on
Thu, Mar 20, 14 at 13:29

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:

Follow-Up Postings:

RE: What's wrong? (Yellow and black leaves)

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.

RE: What's wrong? (Yellow and black leaves)

Can't remember if it's lack of P or K. Research it a bit and come back and remind


RE: What's wrong? (Yellow and black leaves)

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.

RE: What's wrong? (Yellow and black leaves)

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

RE: What's wrong? (Yellow and black leaves)

  • Posted by esox07 4b Wisconsin (My Page) on
    Thu, Mar 20, 14 at 23:59

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.

RE: What's wrong? (Yellow and black leaves)

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.

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