I could plant it in the ground, but I'd rather solve the puzzle. It's something that is cropping up growing them in pots. I consolidated seven big containers of registered plants. The one seen on the left and the new acquisition in the smaller pot in front weren't part of the group, but there were seven behind and to the right of the one still showing a lot of yellow foliage that looked like they were suffering from chlorosis. Most of them are getting greener every day. Some started greening up earlier and are a normal shade. I may have to learn to accept it, but I'd rather figure out a solution. By far the majority of the daylilies, including the seedlings, stay green. I may put the seedling in the ground after it blooms if it still is yellow and see what happens.