Blue Rhododendron. Zones 5 to 8. A blue flowering rhododendron said to be compact in habit.
This is because they are both cold hardy and heat resistant and tolerate sun well. It blooms mid season with violet blue flowers. Department of agriculture plant hardiness zones 4 through 9.
Purple blue rhododendrons.
Purple blue rhododendrons. Rhododendron blue peter. Flowers small lavender blue corolla almost flat about 4 5 cm wide with a short tube 4 5 per truss blooms all along stems. Many cultivars with similar flowers.