Hardy annuals are plants that complete their life cycle in one growing season and can withstand cold temperatures. They typically germinate in spring, bloom throughout the summer, and die off in the fall. These plants are often used in gardens for their vibrant colors and ability to thrive in various conditions. Common examples of hardy annuals include pansies, snapdragons, and calendula. They are ideal for early spring planting, as they can tolerate frost and provide early-season blooms. Hardy annuals are popular among gardeners for their resilience and ability to enhance garden aesthetics.