Don't really know why they are such a bother to you?! They bloom early and then die back to practically nothing. Just
plant around them. Heck they only get to be approx 6" tall.
plant right over them. The worst thing that they might do is send up greenery only later in the season (no
flower). This period of time is one way to locate where the remaining ones are...if you still feel offended by thier presense. Ask around...I AM SURE ANYONE WILL TAKE THEM OFF YOUR HANDS!!! HINT: YOU ARE ONE OF THE FEW THAT ARE TRYING TO GET RID OF THEM.
If it is in an area where you ARE going to put a ground cover, then you can just put in the ground cover with no regard for the grape hyac...all you will ever see is their
flower heads appear and disappear.