For broadleaf weeds in daylilies, you can use Confront herbicide or the slightly cheaper generic equivalent 2-D. You only use
about 3 teaspoons in a gallon of water, and it really does work! One drawback is that if you spray when scapes are forming,
the scapes will curl. Certain weeds need a sticker to adhere to weed leaves, so I used dish soap.
For ANNUAL grasses in daylilies like crabgrass, foxtail and annual bluegrass, you can use Grassout Max. This product claims
that you can also use it in vegetables. I don't think it works on nut sedge or fescue, but I really haven't used it yet... I do fully
intend to use it on a few tomatoes within a few weeks just to see! Grasses in my garden are just barely starting to show up now.