The three things I would eradicate from my landscaping are :
1 - my next door neighbor
2 - his lawn mower
3 - his leaf blower
1 - because he trespasses
into my landscaping sometimes 25 feet or more.
2 - because he uses his lawnmower
to cut down anything in my yard that is green but is not recognizable as grass.
3 - his leaf blower because he just never stops, like the Energizer Bunny, he keeps blowing and blowing...
If I had a fourth choice it would be
Spanish Needle/Hairy Beggarticks/Bidens alba. This is the only plant I ever introduced into my landscaping that made me regret the action. Sure you can make tea from the leaves, chickens will eat any part of this plant, the bees love the flowers, but me - not so much.