Underground Wasp nest under hydrangea bush?

I have a wasp (yellow jacket) nest underground at the base of my hydrangea bush. I don't want to kill the bush, but what can I use to kill the nest? I can't garden there due to the wasps. I can see the hole, right by the base of the bush. Even if I ignore them, will the re use the nest next year or is that not likely to happen? I don't want to use anything that may kill the root system of my bush.

Underground Wasp nest under hydrangea bush?
Get a good wasp spray at your local hardware. Wait until all the wasps have gone home for the night. Then spray directly into the hole. If some try to escape, just continue to spray as they come out. If there are any you see the next day, repeat the treatment. This will not harm your hydrangea.
Reply:Yes, they are awful aren't they!?! I had one a couple of years ago. At night water that area often, keep as wet as you can without killing your shrub. They will leave and not come back the next year.
Reply:There's wasp and hornet killer that you can buy at any hardware store that will be perfectly safe on the root system of your bush.