I am sorry for this delayed reply to your gardening question. We are transitioning to a new Q&A system and your question was unfortunately lost in the transition. I have discovered it now and hope this reply is not too late to be of help.
There are several ways to deal with sorrel in a perennial bed. One way is to dig it out. This is indeed tedious and will need to be repeated to really get the job done. Another option is to apply a general purpose herbicide such as glyphosate (Roundup is one brand) with a wiper applicator taking care to not touch the daylilies, another option is to place 6 sheets of overlapping newspaper over the entire bed making sure to put it right up against the daylily plants. Wet the paper as you lay it to hold it down and in place. Then cover the newspaper with a mulch of leaves, pine straw, etc. This will go a long way toward shading out the sorrel and should last a season. If you have any holes in the paper weeds will poke through, so then cover the hole with more paper and mulch.
Thanks for the question. Please stop in again soon!
Q&A Library Searching Tips