Sanguineum Didymum Tubular dark blackish-crimsom flowers. Primary Color: Red Bloom Time: Late Height in 10 Years: 3' Hardiness (Temperature): 0 Sun / Shade: Morning Sun, Afternoon Shade Landscape Category: Shrub Genus: Rhododendron More plants in: New Plants! Find out if this plant is available: Rhododendron and Azalea Availability List