Hi Dr. Ragamuffin,
Hope all has been well for you!* Unfortunately you don't say how long they've been planted or how you prepared the planting bed.* It does take 2 to 3 years for daylilies to mature enough to become more prolific with their blooms.* They tend to survive in most soils, but do best in soil that has lots of organic matter such as compost.* If your daylilies have been in the ground for a long time they may need dividing.* Deadheading will also extend the season of bloom.* Once they set seed they tend to slow down bloom production.
There are also reblooming and everblooming daylilies.* My daughter and I planted* Hemerocallis 'Big Time Happy' - an everblooming variety, in her yard 2 years ago and they are just starting to become more prolific.* She had good soil to begin with and we added lots of compost.* It's one of the Appster series.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.