Vulcan's Flame Rhododendron Vulcan's Flame Rhododendron has bright fire red flowers. Interesting new growth has red stems. Tolerates sun and heat. Blooms best in a worm spot in the garden. Primary Color: Red Bloom Time: Late Height in 10 Years: 5' Hardiness (Temperature): -15 Sun / Shade: Sun Tolerant Landscape Category: Shrub Genus: Rhododendron More plants in: Hybrid Rhododendrons Find out if this plant is available: Rhododendron and Azalea Availability List