Purple Splendor Rhododendron Purple Splendor Rhododendron has frilled flowers of deep purple with a black blotch. One of the most popular and widely known purple plants. Upright growth habit. Primary Color: Purple Bloom Time: Late Midseason Height in 10 Years: 6' Hardiness (Temperature): -15 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