Silver Circus, I've had it since 1991 when I worked @ Carroll Gardens. I completely neglected it for years and it still bloomed. I'm a bit nicer to it now, sometimes I remember to fertilize it
Also Siloam Toy Time, Vacation Cruise and Real Wind. I got those at the same time and gave them the same non-care. Since Then they have survived my neglect, drought, ice, blizzards, tornados, the Polar vortex and any thing else Ma Nature could throw at them. This year the real test will be if they tolerate deer munchin' them, since they all live in the front yard deer bed now.
Silver Circus
Siloam Toy Time
Vacation Cruise
Real Wind