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Herbaceous ornamentals are plants that have flexible stems and die back to the ground each year. Unlike woody ornamentals, they do not develop persistent woody tissue that lasts through the winter and develop new buds in the spring. Herbaceous ornamentals are divided into annuals, biennials, or perennials based on their life cycles. Annuals die after a growing season. They are sensitive to temperatures that are either too hot or too cold. With biennial and perennial plants, the stems die back, but the crown of each plant survives to produce new growth the following season. These life cycles can be influenced by geography. In the cooler mountain region of the state, a plant may grow as an annual. But in the coastal region, it may grow as a perennial. Herbaceous ornamentals provide interest and contrast that make a landscape lively and interesting. These plants also add depth, dimension, form, and texture to the landscape. Their flowers are often the stars of the garden, providing enchanting colors and fragrances. This chapter provides information on how to select, install, and maintain herbaceous ornamentals, and how to address common problems associated with these plants.