Sappho Rhododendron White flowers have a very conspicuous dark purple blotch. Growth rate is open and very sturdy. This is one of the older hybrids dating back to the 1860?s. Primary Color: White Bloom Time: Midseason Height in 10 Years: 5' Hardiness (Temperature): -10 Sun / Shade: Full Sun Landscape Category: Shrub Genus: More plants in: Hybrid Rhododendrons Find out if this plant is available: Rhododendron and Azalea Availability List