Will Cannas, gladiolas, and dahlias come back yr after yr? (zone 6)?

Cannas are zone 9-12 plants and will not survive the winter in zone 6.



There is one subspecies of Glads that will survive in zone 6- Gladiolus Communis otherwise most prefer zone 9-11.



Dahlias are not too frost resistant and it is strongly recommended to lift out of the ground each year.