Annual begonia plants have many uses in the summer garden and beyond. Annual begonia care is relatively simple when one properly learns how to grow begonias. Watering is important in the care of begonias, as is the right location. Known as wax begonias or bedding begonias, annual begonia plants (Begonia semperflorens) grow quickly, and easily fill in spaces in the garden that will benefit from attractive foliage and frilly flowers. They can be a focal point when planted in mass and are excellent specimens for container combinations.