Though invented by Lovecraft in 1928 [needs confirmation], the name Cthulhu is probably derived from the Classic Greek word chthonic meaning subterranean, as apparently suggested by Lovecraft himself at the end of his 1923 tale The Rats in the Walls.
They're listed as a zone 5-9 plant but as a member of the hibiscus family, Rose of Sharon naturally prefers a warm climate. As a living fence, which is what you really want, you'll be much better off with some kind of evergreen. Juniper, spruce, pine, fir, there are many sizes and varieties to choose from.
1 SOIL / WATER: Average.  OTHER: The Rose of Sharon is considered a bush, shrub, or small tree. They are very tolerant of pruning and you can shape them into whatever form best suits your needs. They grow well in any soil including clay and are able to tolerate drought.