Rhododendron 'Polarnacht' purple incl. decorative pot - Hardy plantA must have for the border. The striking and mystical flowers on the rhododendron 'Polarnacht' look pretty as a picture in your garden or balcony. The mystical flowers are deep purple. The flowers bloom in the spring. Put the plant in a flower pot, balcony planter or the ground immediately upon receipt. The rhododendron loves acidic, humus rich soil. Place the rhododendron in partial or full shade. Ensure that the root ball is moist. Water the plant