Origin of Hibiscus mutabilis 'Rubrus'
Trying to get the history of this long-blooming hibiscus also known as Hibiscus paramutabilis 'Terri's Pink'. I've been growing this plant since 1970. I know of no other outdoor hibiscus that can flower from July to November, or even December in the New York/New Jersey area.
This reddish pink flowering hibiscus seems to be completely sterile. It appears it is likely a mutabilis x paramutabilis hybrid. Monrovia started selling this plant in the early 1960's.
Surely someone knows the story about this plant. Thanks!