http://www.veggiegardeningtips.com/groundhog-wars/ cut and paste
Double Bubble Gum, a Deadly Groundhog Treat?
My next door neighbor flagged me down one day and excitedly told me about the groundhog solution that he had heard about on our local Plant Doctor Radio Show. Noel Falk, the “Plant Doctor” had recommended using “Double Bubble” brand bubble gum to eliminate groundhogs.
Supposedly groundhogs love this particular brand of bubble gum, but once they eat it, it gums up their insides and ultimately kills them. Well we tried this groundhog remedy and something did enjoy the gum leaving behind nothing but the wrappers, but I can’t confirm that it eliminated any of the neighborhood groundhogs.
I haven’t seen the two critters that frequented the area under the neighbors shed lately, but I’m not convinced that the Double Bubble is what did them in. If you’ve tried this solution and it worked for you be sure to let me know of your success.
Other possible methods to eliminate groundhogs include various devices to introduce smoke or gas into the animals burrow to destroy them that way. I’ve never tried any of these control methods and they do require direct access to the groundhogs tunnel. Don’t waste your time trying to flood the critters out with a water hose as I doubt that technique will be successful.