The first thing you will notice when looking at a rhododendron is its size. They are often much taller than azaleas. This is because they are generally grown for their height rather than their width.
Rhododendrons are also generally wider than azaleas, and, well, just bigger!
Another major difference between the two is the shape of their blooms. Rhododendrons have symmetrical clusters of bell – shaped blooms that look like a starburst.
That’s not the complete difference between Rhododendron vs Azalea, for the full story, please read on.