What is it?
Where does it come from?
How do you get rid of it?
This is caused by vines growing on the side of a home. It is common to see this with vinyl or brick homes.
The best way to get rid of this is to use a strong sodium hypochlorite mix to kill the roots in the siding and pull them out by hand. You may also want to hit the spots with a 25-degree nozzle pressure washing tip.