how fast do rhododendrons grow
The American Rhododendron Society measures the growth rates of numerous species and hybrids. Speed of growth is determined by calculating how tall a plant grows in 10 years. Many rhododendron plants grow from 3 to 4 feet in 10 years, but some can grow up to 7 feet in 10 years.Some of the fastest growing rhododendrons are the Brittenhill Bugle, R. genestierianum, Ilam Cream, Mother of Pearl, Professor Hugo de Vries, Spicy Nutmeg, and the Whidbey Island.picy Nutmeg. Spicy Nutmeg is a fragrant, fast-growing rhododendron that has funnel-shaped, 3 1/2-inch wide flowers with wavy lobes. The flowers are pale purplish-pink with reddish-purple rays and spotting in the flower's funnel throat.