Blue flower varieties create a showy display in the landscape, while complementing a range of other flower colors in the garden. Grown in a wide range of sizes and textures, blue flowers range from pale blue to deep, almost purple, blue. Some blue varieties are annuals to grow for a limited time, while others have the added bonus that once planted, grow year after year for a long-lasting garden design.
Georgia Blue Speedwell
'Georgia Blue' speedwell (Veronica umbrosa 'Georgia Blue') is a low-maintenance perennial flower with blue flowers. Growing less than 6 inches tall and 1 to 3 feet wide, speedwell is an ideal ground cover or planting for the front of a flowerbed. Deer and drought tolerant, speedwell attracts butterflies to the garden. Beginning in spring and lasting into summer, speedwell flowers emerge to blanket the ground with their bright color. The dark green leaves of Georgia blue speedwell are small and turn burgundy during the winter. Versatile, speedwell grows in a wide range of soil conditions, including overly dry and wet soil. Speedwell requires full sun to part shade and well-drained, humus-rich soil. The U.S. Department of Agriculture Hardiness Zones for planting are 6 to 8.
Blue star (Amsonia tabernaemontana) is a perennial flower with pale blue flowers. Growing 2 to 3 feet tall, blue star has an open, upright form. The large clusters of flowers have 5 narrow lobes that shoot up through the foliage. Growing less than 1 inch wide, spring-blooming, blue star has lance- and egg-shaped leaves that grow 2 to 4 inches long. Smooth, the narrow leaves are pale green and complement the pale flowers. Blue star flowers require full sun to part shade and moist, well-drained soil that is nutrient-rich. The zones for planting are 3 to 9.
Blue False Indigo
Blue false indigo (Baptisia australis) is a perennial with a moderate growth rate and a spreading habit. The blue flowers on blue false indigo grow on tall, upright spikes that emerge in late spring. Drought tolerant, blue false indigo grows 3 to 6 feet tall and 1 to 3 feet wide. Blue false indigo attract butterflies and fits well in a cottage garden or as the backdrop for the flower border. False indigo make striking fresh cut flowers and when divided in early spring, can be grown throughout the garden. Blue false indigo requires full sun to part shade and well-drained, porous, sandy soils to thrive. The zones for planting are 3 to 9.