How to kill unwanted bushes in front yard?

pull them out or get a shovel and dig them out, its pretty simple to do.

if you can't just pull it up, try pouring boiling water over it. it should either die or eventually be easy enough to pull out on you're own. i'd try to steer clear of poisons or salts because they can mess up the dirt for anything else that grows there/could poison or sicken animals.

Put some salt around it. Some days later, put some again, etc.. Little by little that will kill it.