Before planting, the physical characteristics of the site must be evaluated. Consider the site's soil type, fertility, drainage and its exposure to sun and wind. Compare site characteristics with specific plant requirements. An annual plant adapted to site conditions grows and flowers more vigorously and has fewer pest problems. Some plants intolerant of heat and sun may perform adequately when planted in part shade.
Annual flowers offer flexibility in landscape design.
Any planting can be changed each growing season, creating an entirely new design. As a part of their quick change potential, annuals can be used as a temporary solution in a problem site. Others should be started indoors and transplanted outdoors at the appropriate time. Some annuals, such as larkspur, can be fall seeded. Growing seedlings indoors requires proper light and temperature, a pasteurized growing medium and several weeks of careful attention.