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.
Rose of Sharon is a dramatic flowering shrub that is often pruned into a small tree formation. It can grow up to 8 feet high, and produces large white, blue or purple flowers. Rose of Sharon plants grow well in urban environments and tend to attract butterflies and hummingbirds. When grown from seed, they can take three to four years to mature and bloom.