A friend of mine that runs a hotel had the same problem and used this stuff:
http://www.critter-repellent.com/groundhog/groundhog-removal.php
Said it worked great. They were burrowing under the dirt surrounding 4 steps into the backside of the building.
If you were a member of my extended family I’d tell you first to boil them, then bake them, then...bon appetit.
Mothballs.
I’ve found .22 long rifle, any brand, works well. The hollow point flavor preferred.
Generic cleaning amonia on a couple of cotton rags.. shove it down the hole. Always works.
Easy to trap using a home-built wood box with a drop trap door at the end. I’ve found very effective for groundhogs and also cats. I originally found plans for such a box trap on the web (BackHome magazine, or Mother Earth News)
I even caught one a couple of years ago using a plastic milk crate tipped up, with lettuce and carrots for bait; then slipped a metal sheet underneath in order to haul the critter away. They can get heavy.. I’ve seen them reach 20# (yes, I’ve weighed them). Unfortunately I had to trash the milk crate, ‘cause thew critter chewed it up pretty good in the brief time he was in there.
Box is ~12x12x18”; metal grate on half of top to see contents, 1x1 wood strips to form a slide slot for the drop door (piece of 12x12 plywood).
An effective repellant: coyote urine (readily found online.. I found a local discount store that had 8oz bottles for $5 — it really works at keeping them away, and no longer trying to burrow on your property.
http://www.bloomingarden.com/cropculprits.html
I’ve tried this http://www.critter-repellent.com/groundhog/groundhog-removal.php but didn’t think it was worth the cost.
Trap and relocate is the way to go, then make the area unattractive with Coyote Urine.
Kere’s further reading http://www.motherearthnews.com/Organic-Gardening/1979-05-01/Goodbye-Groundhogs.aspx
http://forums2.gardenweb.com/forums/load/cornucop/msg0600255732508.html
http://blog.amystewart.com/2008/07/mammals-of-mass.html
Box trap plans http://www.mdc.mo.gov/documents/nathis/woodwork/ww10.pdf It shows how to make a wooden box trap for rabbits but you could change the dimensions for something bigger if you wanted!
A neighbor of ours had a hog take up in one of his tobacco
barns,he made his burrow under one of the center posts,dropped
the barn about 8” in the middle with the weight of all that tobacco
He caught the hog with a live trap with carrots in it and released
it on the back of the farm
I`ve got a hog thats gotta be 10 yrs old under a shed in the back
yard,we`re good buddies
Make friends with ‘em. Train ‘em to do tricks. Pet ‘hogs...quite a novelty.
You could run a hose from an exhaust pipe into the den and let it run for a while.
Sometimes it works and sometimes it doesn't. But it is worth a try.
See if you can rent one of these:
http://www.garden-counselor-lawn-care.com/gopher-blaster.html
http://www.youtube.com/watch?v=GrGnW0KLFZk
I can just hear the conversations around their dinner table now......."How do we get rid of those people? Stink bombs don't work....