Watering Annuals Annuals are shallow rooted so don't allow the soil to dry out too deeply. Begin watering in the morning and water through the heat of the day. Stop in mid-afternoon to allow the plants to dry off before nightfall. Night waterings can create ideal conditions for disease development. During periods of very hot weather, water earlier in the morning.
Annuals complete their life cycle in one growing season.
Seed germinates in the spring, the plant grows, flowers, produces seed and then dies. Perennials live for more that one growing season. There are two types of perennials. Herbaceous perennials generally die to the ground at the end of the growing season but send up new shoots the following spring. Woody perennials, such as trees and shrubs, do not die back to the ground but get larger each year.