Many gardeners dream of all-season color in their gardens. Unfortunately, most annuals and some perennials only produce flowers for a short time. Gardeners often get around this by planting their gardens in waves. Other gardeners select plants that are known to bloom all season long. Typically these plants are short-lived annuals. However, some varieties of perennials also produce color all season long.
Although some species of roses bloom in a single flush of color, most varieties of shrub roses bloom continuously from spring to fall. Shrub roses are round in shape, hearty toward cold and resistant to disease. These roses are some of the few perennials that will bloom continuously throughout the summer months. To ensure that shrub roses bloom for longer periods of time, fertilize these roses every two weeks through the summer months and deadhead roses as they finish blooming.
For all-season color, annuals are the rock stars of the plant world: showy plants that have a shorter life span. Most annuals are not hearty and die once the first frosts settle in. Impatiens that are moved indoors to overwinter usually become leggy and die after their second year. Impatiens love full shade and moist soil conditions. They droop when the soil dries and are ready to be watered. These plants can grow tall enough to appear as low-growing shrubs.
Impatiens and petunias go hand in hand as the color favorites for most season-long color. But where impatiens mound up in the shade, petunias like to spread out in the sun. These plants are favorites for ground cover, as well as trailing baskets and window boxes. Older varieties of petunia require more care than newer hybrid species such as the wave petunia.
Morning glories have gained an association with fence rows because in many parts of the country these self-seeding vines were left to grow wild in these fence rows for color. Morning glories require little in the way of care. They flower better when they grow in poor soil. Nutrient-rich soil will cause the morning glories to produce more foliage and fewer flowers. Since the plant is self-seeding, it can become invasive.