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.
These hard-working shrubs bloom during the heat of the summer, adding much-needed color in the mid level of the garden, above blooming annuals. Rose of Sharon shrubs are in the hibiscus family and have the same colorful trumpet-shaped flowers that tropical hibiscus have, only these shrubs are hardy to zone 5. If deer are a problem in your area, Rose of Sharon plants are a must-have. They grow best in full sun and well drained, moderately-moist soil.