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.
Despite its name, the deciduous flowering shrub we call rose of Sharon isnât a rose at all. Native to Asia and India, this plant with exotic-looking blooms is actually a hibiscus (Hibiscus syriacus), a member of the mallow family. Other common names include shrub althea, Chinese hibiscus and hardy hibiscus.