Sometimes we plant something that grows into a monster.
Sometimes the previous owner planted a monstrosity.
Sometimes an invasive plant moves in to our garden.
How do we kill it?
1. Dig it up and throw it away. If only it was always this easy.
2. Spray it with herbicide ( or a very strong vinegar ). Cut it back after the herbicide has time to work ( a week or two ), then spray anything that dares to regrow with more herbicide. Repeat until till dead.
3. Cut it down, heavily douse the ground near it with fertilizer, cover it with dark plastic and put mulch on top of the plastic.