There have got to be better looking alternatives than old dirty tires to make a fence. Just plant some Oleander.
If you’re really determined, try Blackberry Bushes. But be careful, Blackberry bushes tend to take over the entire area, and the limbs are covered in sharp thorns.
Thistle worked for the Scots, centuries ago.
Probably gorse. There are homesites carved out of the gorse, south of here. God help you in a fire.