Annual flowers are flowers that finish their life cycle in one growing season. Annuals are usually classified into three groups: hardy, half-hardy and tender.
Types
Hardy annuals thrive in cool weather and are usually planted in the fall. Half-hardy annuals can endure light frost; they are generally planted in early spring. Tender annuals die in freezing temperatures and are planted in the spring.
Examples
Zinnias, petunias, pansies and sunflowers are a few common annual flowers.
Advantages
Annuals are relatively inexpensive, versatile and hardy. They are also easy to grow and are very colorful.
Disadvantages
Annuals must be replanted each year, which can be expensive and time-consuming. Some annuals need maintenance to continue blooming through an entire season.
Considerations
Some perennials (plants that live for more than two years), such as begonias, some impatiens, a few snapdragons and geraniums, are sometimes grown as annuals in climates where they are not hardy enough to survive the winter.
Source: http://www.ehow.com/facts_5590058_definition-annual-flowers.html
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