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.
Additional Facts. Resembling a bouquet of hollyhocks, rose of Sharon (Hibiscus syriacus) grows as a deciduous shrub up to 12 feet tall and 6 feet wide in USDA plant hardiness zones 5b through 11 and can also be trained into a single trunk with a treelike top or as an espalier.