Azaleas and rhododendrons are popular flowering shrubs. They look similar, but they have some key differences. Here’s a simple guide to help you tell them apart.
Botanical Background
Azaleas are a type of rhododendron. All azaleas are rhododendrons, but not all rhododendrons are azaleas. Both belong to the Rhododendron family, but azaleas used to be classified separately. Now, they are part of the rhododendron family. There are two main types of azaleas: evergreen and deciduous.
How to Tell Them Apart
Azaleas and rhododendrons look different in several ways.
Flowers
- Azaleas have funnel-shaped flowers, often with a pleasant scent. Rhododendrons have bell-shaped flowers.
- Azaleas have five stamens, while rhododendrons have ten or more.
- Azaleas have individual flowers, while rhododendrons have large clusters.
- Azaleas come in more colors, like white, pink, red, and yellow. Rhododendrons mostly have pink, white, purple, and red flowers.
Leaves
- Rhododendron leaves are bigger and thicker. Azalea leaves are smaller and softer.
- Azalea leaves are oval or pointed. Rhododendron leaves are rounder or broader.
Growth Habits and Environments
Size
- Rhododendrons grow bigger and can even become trees. Azaleas stay smaller and bushy.
Deciduous or Evergreen
- Most azaleas lose their leaves in fall. Most rhododendrons keep theirs all year. However, some azaleas are evergreen too.
Light
- Azaleas can handle more sun. Rhododendrons do better in the shade.
Care Tips
Azaleas
- Water deeply but not often.
- Fertilize with acid-loving plant food.
- Prune after blooming to keep them looking nice.
Rhododendrons
- Water regularly to keep the soil moist.
- Fertilize with food for acid-loving plants.
- Prune dead flowers and shape after they bloom.
Popular Varieties
Azaleas
- ‘Rosy Lights’: A small shrub with red flowers.
- ‘Golden Lights’: Cold-tolerant with yellow-orange flowers.
- ‘George L. Taber’: A pink flower with white edges.
Rhododendrons
- ‘Blue Diamond’: Compact and violet-blue.
- ‘Nova Zembla’: Red flowers and a small bush.
- ‘Cunningham’s White’: White flowers with copper spots.
Environmental Benefits
Rhododendrons help protect mountain ecosystems by providing food and shelter for animals. Native rhododendrons also support local biodiversity, unlike some non-native azaleas.
Conclusion
Azaleas and rhododendrons each have their own special qualities. Understanding the differences will help you pick the best plant for your garden.