How do you kill buckthorn stumps?????

[MMG]

Metal barrel open on both ends placed over the stump. Fill with dry wood then soak with K1 or diesel fuel. Set it on fire and enjoy.

Forgot to mention lawn chairs, beer, and good friends!

 

[DLCRL]

Diesel and a match in the winter works wonders lol, seriously though the DNR does controlled burns to impede it's growth in the fall and spring, I've seen them.