There are certain plants that I know having almost the same form of bloom : Hibiscus Syriacus, Hibiscus Sinensis, Lavatera, Malva , and Hollyhock. From all the aformentioned, only Hibiscus Syriacus becomes enormous when unpruned. And also he is the only frosthardy Hibiscus for where you live. I have 5 of them here in Belgium, very happy all of them. But I have also 3 Hibiscus Sinensis as potplants, hibernating in the heated glasshouse every winter. Hibiscus Syriacus' common name in England is Tree Hollyhock.
In the Corfu part of "Garden Tours",that you have recently seen, among the flower photos, 5 of the shown blooms are Hibiscus : the no 18 is Hibiscus Syriacus, and you can also see him in the "Old University " photo of Corfu. The nos 1, 14, 15, and 19 blooms are Hibiscus Sinensis, single and double ones.
"..So,perhaps, it is easiest, through awareness of flowers in particular, of their radiant beauty and purity, their vibrant colour, to come to the excellence of the One and be uplifted beyond thought to our divine selves".Dorothy Maclean