If you are willing to use chemicals in your garden, look for the grass killer that contains flauzifop. It is an "over-the-top" for quite a number of plants and does in fact name daylilies among the plants it can be used on without causing a problem. There are a number of other plants listed where mild-to-heavy toxicity can occur, so be sure to check on all the plants you might use it near. When I used it, I still tried to keep it off other plants regardless of what was said about it being safe.
There are many products that contain this chemical and it does kill many other grasses besides Bermuda, so don't use it on your lawn to get rid of a patch of Bermuda. There are concentrates as well as ready-to-use products. A few states have banned it (I noticed "Alaska, Hawaii, Michigan, Minnesota, Washington, U.S. Territories or International" were mentioned on the label for Fusilade II herbicide. Here are a few other names for flauzifop - - Flauzifop p-buty or butyl(RS)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phen
oxy]propanoate. The label says it takes about a week before yellowing occurs.
