Supernova Rhododendron Supernova Rhododendron has rich, deep rose-red flowers on strong stems. Plants have large foliage of heavy substance. Upright habit. Primary Color: Red Bloom Time: Midseason Height in 10 Years: 5-6' 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