What’s the difference between a rhododendron and hydrangea?

As a gardening and landscaping expert, I have had the opportunity to work with both rhododendrons and hydrangeas extensively. These two flowering plants have distinct differences in terms of their appearance, growth habits, and seasonal changes.

When it comes to the appearance of their flowers, rhododendrons and hydrangeas vary in color and shade. In general, rhododendron flowers tend to be darker in hue, ranging from deep purples and reds to vibrant pinks and whites. On the other hand, hydrangea flowers come in a wider range of colors, including shades of blue, pink, purple, and white. They often have a lighter and more pastel-like appearance compared to rhododendrons.

Another notable difference lies in how these plants behave when their flowers die. If left unpicked, hydrangea flowers tend to dry up and hold their form even after they die. This means that you can enjoy their dried flowers throughout the winter, adding a touch of beauty to your garden during the colder months. In contrast, rhododendron flowers drop when they die, leaving behind bare branches and leaves during the winter season. This can create a different visual experience in your garden during the colder months, as the focus shifts more towards the foliage of the rhododendron plants.

In terms of growth habits, rhododendrons and hydrangeas also differ. Rhododendrons are generally more compact and bushy, growing in a rounded shape with dense foliage. They can range in size from small shrubs to larger, tree-like specimens. Hydrangeas, on the other hand, have a more open and spreading growth habit. They often have long, arching branches and large, broad leaves that give them a more relaxed and graceful appearance.

When it comes to seasonal changes, both rhododendrons and hydrangeas have their own unique characteristics. Rhododendrons are known for their evergreen nature, meaning they retain their leaves throughout the year. This can provide a sense of greenery and structure to your garden even during the winter months. Hydrangeas, on the other hand, are deciduous plants, which means they shed their leaves in the fall. While this may leave them bare during the winter, it also allows for stunning displays of fall foliage before the leaves drop.

The differences between rhododendrons and hydrangeas can be seen in their flower colors, the behavior of their flowers when they die, their growth habits, and their seasonal changes. Rhododendrons tend to have darker-colored flowers and drop their blooms when they die, while hydrangeas offer a wider range of flower colors and retain their dried blooms throughout the winter. Rhododendrons have a more compact and bushy growth habit, while hydrangeas have a spreading and graceful appearance. Additionally, rhododendrons are evergreen, while hydrangeas are deciduous. These variations make each plant unique and can be considered when designing and planning your garden.

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Caroline Bates

Caroline is a Miami-based landscaper who specializes in drought-tolerant landscapes. She is the mother of two young children and also enjoys writing for GreenPacks.org in her spare time. Caroline takes great pride in her work, and loves being able to share her knowledge with others through her writing.