Can a Argyranthemum stay outside all year?

No, Argyranthemum are typically not cold-hardy and may not survive the winter if left outside in areas that experience periods of frost or freezing weather. Argyranthemum are generally considered to be half-hardy or tender perennial plants in most climates. They thrive best in Mediterranean-like climates with mild winters and cool, dry summers.

In some warmer regions with a mild winter season, gardeners may be able to successfully overwinter Argyranthemum by providing some protection from frost and寒风. However, in areas with colder climates, it is generally best to grow Argyranthemum as annual plants or to bring them indoors during the colder months.