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.
Adeniums, commonly known as Karoo Rose, Desert Rose, or Impala Lily, originate in the hot dry regions. of Africa, the southern edge of the Arabian Peninsula and the island of Socotra. Different varieties of Adenium are similar in that they all produce attractive flowers and also usually. produce a fat stem near the base (the caudex).