Have you had lots of rain? Enough that the soil doesn't get to dry out at all? Like Peter said, over-watering, overly wet soil that isn't allowed to dry out between waterings causes them to turn yellow.

Dave

digdirt2...Have you had lots of rain...

Doesn't really apply - all plants are in raised beds filled with compost. Drainage is really good - even with steady rain.

Peter, planted them 4/24...should be over transplant shock by now. Weather has been ideal to prevent this anyway.

Are your plants too large to gently dig one up and look at the roots? I've had problems with ants under my pepper plants before that didn't show above soil level. They just looked yellow and weren't thriving. After relocating them they perked up. Also giving them a shot of epsom salts(about a tbs in a gal of water)may help green them up. JME

It could be you put to much nitrogen in when you planted them and it's burning the plant.

Concerning epsom salts, I sprinkled between 1 teaspoon and 1 tablespoon around the plants and watered that in. From everything I've read, that shouldn't have been too much.

Could be the nitrogen, but I didn't put very much into the soil. I had broccoli in the same place these peppers are in in the winter. The broccoli did nicely - and the nitrogen I put in was in the form of blood meal. Followed the directions on the pack. These are all really good ideas so far, but I've though of these things and don't think it is any of them. I'm beginning to think it may have something to do with not having one of the micro nutrients in the soil.

If not nitrogen, could be iron deficiency. Iron chlorosis will show yellowing, though typically the leaf veins remain green. May be different in pepper plants, not sure. But try some ironite and see if that helps. A PH check couldn't hurt, as excessively acid/alkaline conditions can affect nutrient availability.

Can you post a picture of them? It would help narrow possible problems. Otherwise it is just guess work.

Dave

I have my peppers in raised beds too with great drainage, but we had 3 weeks of straight rain/clouds and I noticed mine turned a little yellow green too. But after a week of full sun they are now back to normal. It could be this. Have you noticed the color getting back to normal now that we've had a week of no rain?

Planterjeff, I have noticed the bell peppers are beginning to kinda come around. It may have just been all the rain and cloudy weather. Can't say for sure, but I haven't done anything else to them. Keeping my fingers crossed. The New Mexico chili peppers I planted still aren't doing so good, but that could be due to the hot humid weather. It gets hot in New Mexico (where these peppers originate, but not as humid as South Louisana, so that could be the answer to those peppers. Thanks for the input.