Just a message of hope for all you fellow Grape Hyacinth Haters out there (and ohhhh how I hate them….).
I’ve been fighting them for four years now, carefully pulling each bulb one by one. My front yard is now on year two of being totally clear. The backyard is on year three. I still have a narrow strip back by the hives that has a few, but I’ve been doing serious battle on those and expect to be completely free next year.
It can be done!
Happily, the driveway between my lawn and my neighbor’s lawn, which is infested, has served well enough to block further spreading my way.
I still have not found a poison that effectively controls them unless the bulbs are very shallow. If they are shallow, a standard weed killer tends to work well enough. Whenever I pull a particularly nasty shovelful of earth, I’ll sometimes soak the hole with week killer to get any bulbs that were left behind before filling the hole with clean soil. It seems to work quite well.