Thank you, Sharon.
Umm, if I used coir again, even outside, I would rinse the heck out of it first. Some cheap vendors have salt in their coir ... I don't know, do they float their coconuts in the ocean or something?)
>> I also intend to prepare a bed for seedlings which will be planted next spring. Would I use the same products to amend the soil in the seedling bed as I would in the bed for the larger DLs?
Again, I think that's a fairly technical question about daylilies. I know nothing. I would try to narrow down whether I had almost no N, or some strange reason the tube didn;t have any color at all. Have other things grown vigourously there, to indicate it is already fertile?
Many plants' seedlings do NOT want much fertility if you want them to grow stocky and healthy. So MAYBE low fertility is what you need ... again, I would listen to those with specific relevant experience.