The Pacific Northwest climate is suitable for a wider choice in flower selection than almost anywhere else in the U.S. There are flowers which will bloom in every month of the year. Perennial flowers will live through the winter and bloom for several years. Biennial flowers are planted one year and bloom the next. Most annual flowers are planted in the spring or summer and are killed by frost in late fall. Annual flowers such as pansies, violas and flowering kale, can be planted in the late summer or early fall to provide color during the winter and spring months.