Three Facts You May Not Know About Rhododendrons

 

During a recent trip to the west side of the mountains in Washington State, I was treated with many sightings of blooming rhododendrons.  These giant of flowers are very impressive when in full bloom! I live on the east side of the mountains where there are few growing because the conditions are not optimal.

Here are a few little-known facts.

Fibrous Root Ball

Rhododendrons have shallow, fibrous or hair-like roots. They cannot tolerate dry, hot conditions. Because of this, they grow more successfully on the cooler, wetter west side of Washington State where I was visiting. During the first year after planting, they need plenty of water. It takes longer for the small root hairs to grow out of the original root ball. Because of the shallow roots, cultivating is not recommended. A thick layer of mulch provides lots of root protection.  

Invasive

Some varieties of Rhododendrons are invasive in certain parts of the world.  An invasive plant is any plant that is, “not native and has negative effects on the economy, the environment, or health. “ This is true for a cultivar of rhododendrons that is commonly found throughout the British Isles and other parts of the world. Rhododendrons thrive in mild, moist climates with slightly acidic soils. In these areas, rhododendron plants have been found to destroy habitats of other plants and animals because of their aggressive growing habits. 

Fragrance

Most people are unaware that there are a few varieties of rhododendrons that have fragrance. Plant breeders have managed to develop other cultivars that have fragrance too. The flowers of these aromatic blooms tend to be lighter in color; for example, white, light pink or light yellow. The strength of the perfume of any flower is made stronger with warmer temperatures.   

Have you grown rhododendrons successfully in your area?