Do Cape Sundew need a dormancy period? If not, could it still survive winter temperatures with the rest of my dormancy plants?
It is according to the zone you live in. If your winters are about like Southern Florida, zone 10, rarely reaching 35 degrees Fahrenheit for a few hours at night, then yes, it could potentially survive it. It would die back to its roots all winter though. It is a tropical and does not require dormancy. Keep it indoors in a sunny window and enjoy it all year.
I agree with Mutant, keep it inside.
They do well on a window sill, all year long.