Chick Wasitis of Bridgewood Gardens in Maryland registered this hybrid of H. 'Uncle Albert' × unknown in 2008. It forms a semi-upright plant of medium size with bright red petioles.

"2008 Registration: H. ‘Mustang Sally’ This was registered with incorrect parentage as [H. ‘Uncle Albert’ × H. plantaginea] It should have been [H. ‘Uncle Albert’ × unknown]."