Blitz Rhododendron Blitz Rhododendrons have very dark red flowers. Sun and heat tolerant shrub. Mounding growth habit. Primary Color: Red Bloom Time: Height in 10 Years: 3' Hardiness (Temperature): -5 Sun / Shade: Sun Tolerant Landscape Category: Shrub Genus: Rhododendron More plants in: New Plants! Find out if this plant is available: Rhododendron and Azalea Availability List