"Harri85274" wrote in message
...
I thought they were annuals.

Crysanthemums are for the most part perennials and are typically listed as
hardy to zone 5. However, they have been hybridized so radically, many
cultivars are much less hardy. What are commonly sold as "garden mums" are
generally treated and sold as annuals, however with mulching in fall, they
will frequently overwinter with ease, specially in warmer zones. Those
labeled and sold as Dendranthemum ('Clara Curtis', Mary Stoker') should be
reliably perennial down to zone 5.

FWIW, many plants typically sold as "annuals" are in fact tender perennials.

pam - gardengal