Popular garden plant due to the long bloom season, which is year-round in frost-free climates. Light frosts just kill some of the tender growth, while heavy freezes (*Sunset zones 8-10, 14, 29, 30) can seriously damage or kill the plants. In other colder zones, they can be grown as annuals. | Popular garden plant due to the long bloom season, which is year-round in frost-free climates. Light frosts just kill some of the tender growth, while heavy freezes (*Sunset zones 8-10, 14, 29, 30) can seriously damage or kill the plants. In other colder zones, they can be grown as annuals. |