just 8 ounces of gas will kill the whole nest of yellow jackets and from my experience is the best thing for them. I can't say if it will harm the daylilies but I can say it didn't harm a small goumi bush, a fig tree, and few natives. Also the grass around the hole is not affected but keep in mind I only use about 8 ounces and have successfully killed more than 7 nest at my new property and countless others as a youth without any plants being lost in the process. If anyone wants to rid the yard of these aggressive wasps first locate the hole and toss something near it so you can find it later that night. The yellow jackets stay active until night. Around 9pm they are all home and tucked away so 9 or later is the only way to kill them all. creep up on the hole and dump the gas in. Don't light it just walk away and they will die from the fumes. If you light it they will not die and will make a new nest somewhere else. I don't know why lighting it don't kill them but trust me it don't. One side note is when any holes have been near my plants I did put the hosepipe at the hole and flushed it the next day for about an hour on low because I too was afraid I'd loose one of my plants. They tend to like the base of shrubs and trees especially newly planted one less than 3 years in ground. On older trees they tend to like pines not sure what the link is but I have been dealing with them my whole life since a child when my grandpa showed me how to get rid of them so I have some experience with them even if only the redneck way.
