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What's the difference between an annual and a perennial?
Annuals are plants that are intended to last only one growing season- they die in the winter and then must be replaced the following spring. Perennials are plants which go dormant in the winter and grow back the following season on their own. Perennials generally get bigger from year to year and often can be divided after two or three years.
Occasionally annuals will appear to grow back on their own after the winter. This is usually because the plants the year before produced seed and reseeded themselves rather than actually remaining alive through the winter as perennials do.
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