https://www.rhs.org.uk/plants/152070/hibiscus-syriacus-purpureus-plenus-(d)/details
Hibiscus syriacus 'Purpureus Plenus' (d) | /RHS
hibiscus syriacusplenusrhs
https://www.houzz.com/discussions/1933495/hibiscus-syriacus-blue-bird-vs-blue-satin
hibiscus syriacus 'Blue Bird' vs 'Blue Satin' | Houzz Forum
Hi, I'm looking into 'Blue Satin' as my 'Blue Bird' (at about 7 feet) died one spring - likely from a cold winter. Does anyone grow both of these, or at least...
hibiscus syriacusblue birdvssatinhouzz
https://www.rhs.org.uk/plants/132681/hibiscus-syriacus-edna-frances/details
Hibiscus syriacus 'Edna Frances' | /RHS
hibiscus syriacusednafrancesrhs
https://www.rhs.org.uk/plants/132881/hibiscus-syriacus-boule-de-feu-(d)/details
Hibiscus syriacus 'Boule de Feu' (d) | /RHS
hibiscus syriacusbouledefeurhs