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.
Desert rose is hardy outdoors only in U.S. Department of Agriculture plant hardiness zones 11 and 12, but you can enjoy it as a perennial potted plant year-round in any climate.. Water the desert rose when its soil feels almost completely dry when you insert your finger into the soil. Water until moisture begins to drip from the bottom of the pot, indicating the soil is moistened throughout the plant's root zone.