Blue flowering plants in Florida produce flowers from a pale pastel shade to shades of blue so deep, they are almost purple. You can choose from annuals, perennials or shrubs to design a garden that is all blue, or use your imagination and combine them with other colors such as with red and white for a patriotic display.
Larkspur (Consolida ajacis) is also known as rocket larkspur, annual delphinium and annual larkspur. It grows from 2 to 3 feet tall and produces bright green feathery leaves and blue, white, pink or lilac flowers from spring through summer. The plant is an annual and needs full sun and moist soil. It is hardy in all of the planting zones in Florida. The plant works well in flower beds and as borders and will attract hummingbirds.
Blue Butterfly Bush
Blue butterfly bush (Clerodendrum ugandense) is also known as blue glorybower. The evergreen shrub grows to 10 feet tall and just as wide. The plant produces egg-shaped leaves that grow from 3 to 4 inches long and 1-inch-long flowers that grow in clusters at the ends of the branches. The petals look like a butterfly. Blue butterfly bush needs partial shade and moist soil. They grow best in one zone in Florida, zone 10, the hottest. Further north, it will die back in the winter and return in the spring. The plant does well as a stand-alone specimen plant or in a shrub border with other varieties.
Rose-of-Sharon (Hibiscus syriacus) is also known as althea. The shrub grows from 6 to 10 feet tall and 3 to 5 feet wide. The plant produces flowers that measure 3 inches across. It needs partial sun, getting the shade in the afternoon, and soil that is well drained. The plant grows anywhere in Florida, except for the far south, and can be planted alone or in groups.
French hydrangea (Hydrangea macrophylla) is also known as bigleaf hydrangea. It grows from 3 to 6 feet tall and 3 to 6 feet wide. The shrub produces blue flowers if the soil is high in acid and medium to dark green leaves. It likes loose well-drained soil and full sun or partial shade, with the shade coming in the afternoon, and it can be grown in all of Florida. It does well in a mixed shrub border or in a flower bed with tall annuals or perennials.