Are able to withstand cold soil and hard frosts.Include plants such as pansies, ornamental kale, and dusty miller.Their capability to tolerate early spring and fall frosts and winter temperatures.When seed can be sown outdoors in the spring.Annuals are frequently grouped as "hardy," "half-hardy," or "tender." This refers to: Except for those that reseed themselves, annuals will not grow a second year unless they are replanted. These plants are not cold hardy and are not able to withstand winter temperatures in our hardiness zones (zones 4b to 6b, average annual minimum temperature between -25 F and 0 F). Many plants treated as annuals in northern climates such as Pennsylvania are actually perennials when grown in southern climates. A few, known as winter annuals, germinate in the later summer and autumn, are dormant during the winter, and grow during the next spring and summer. Most are planted in the spring, bloom in the summer, and die in the fall. AnnualsĪnnuals take a single year to complete a full life cycle. Perennials will bloom for 2 to 8 weeks or longer, however, bloom time will vary and can occur during the beginning, middle, or end of the growing season. Annuals will provide continuous blooms throughout the growing season, while biennials provide blooms during their second year of growth. Generally, these groups are annuals, biennials, and perennials. Plants are classified by the number of growing seasons required to complete their life cycle.
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