Black Sport Rhododendron Black Sport Rhododendron has unusual flowers which make this an interesting addition to the landscape. Flowers are dark purple-red with a deep black-red blotch on the upper lobe. Stiffly upright growth habit. Primary Color: Purple Bloom Time: Late Height in 10 Years: 5' Hardiness (Temperature): -5 Sun / Shade: Morning Sun, Afternoon Shade Landscape Category: Shrub Genus: Rhododendron More plants in: Hybrid Rhododendrons Find out if this plant is available: Rhododendron and Azalea Availability List