Cheerful Giant Frilly straw yellow flowers 3 1/2 inches across. Primary Color: Yellow Bloom Time: Midseason Height in 10 Years: 5' Hardiness (Temperature): -20 Sun / Shade: Morning Sun, Afternoon Shade Landscape Category: Shrub Genus: Rhododendron More plants in: Azalea Find out if this plant is available: Rhododendron and Azalea Availability List