The Hydrangea Soft Blue flowers are cut and used in floral arrangements. These soft blue flowers in rounded clusters are grown on a flowering shrub called Hydrangea Soft Blue that needs partial shade and moist, well-drained soil. These flowers typically bloom from mid-summer to early fall and can be up to 8 inches (20 cm) in diameter. Hydrangea Soft Blue shrub is a popular choice for landscaping and can be used in a variety of ways, such as in borders, as a specimen plant, or as a hedge.