A Annual is a plant that germinates and flowers in 1 year. Some seeds life cycles are a month however most are many months. Most annuals grow tthrough out the warm seasons.Winter annuals germinate in the fall or winter and bloom in the fall, winter, and early spring. They are known to be weeds but they in reality just die out in the summer and re bloom in winter. Winter annuals also grow lower to the ground to protect there selves from the winter elements. I have listed some types of annuals so you can get an idea of what a annual is.
Ornamental annuater perennials grown as annuals are, impatiens, begonia, snapdragon, pelegonium, coleus, and the petunia.
True annuals are corn, lettuce, peas, cauliflower, watermelon, bean, and the zinnia.
Winter annuals are henbit, deadnettle, chickweed, and winter cress.