Caryopteris 'Heavenly Blue' blue - Hardy plantHeavenly blue. It is easy to see how the Caryopteris clandonensis 'Heavenly Blue' got its name! There are countless tiny blue purple flowers on one shoot. They look like they are floating! The 'Heavenly Blue' also attracts bees and butterflies. You can also use as a cut flower in a vase. The plant is winter hardy. The flowers bloom from the end of summer to the beginning of autumn. If necessary, cut branches off at the base in spring. Place the plant