Dahlias have this simplified beauty that’s easy to adore. Prized for its cheerful blooms and a stunning display of vibrant colors, it’s no wonder this tuberous perennial is a gardener’s favorite. Originating from Central America and Mexico, these flowering plants can be finicky when it comes to temperature. While there are a few heat tolerant dahlias, most prefer a cool climate and can be quite temperamental in the heat.
But what if you’re in the South or somewhere with a warmer climate? Does it mean you can’t enjoy these lovely blooms? Let’s look at heat tolerant dahlias.
2 Important Things to Remember When Growing Dahlias in Hotter Regions
Growing dahlias in warm climates can be challenging, but it’s not impossible. According to John Kreiner, an expert who has been growing dahlias for over 30 years in the South, two things are needed to successfully grow dahlias in warm climates.
Mulch Your Dahlias
You need to be able to keep dahlias alive even during the summer heat. This means that means you’ll have to give them some extra care. One way to do this is by mulching your dahlias. By mulching, you’ll be able to protect the tubers from excessive heat and prevent them from drying out. This way, you’ll be able to enjoy its blooms once the temperatures start to cool down.
Mulching keeps the soil cooler than if it were left exposed to the elements. Add at least 2 inches of organic mulch that allows water to pass through easily.
Choose the Right Dahlia Variety
Not all dahlias are created equal; some are more heat tolerant than others. However, considering there are over 5,000 dahlia varieties, there are some among the thousands of varieties that can tolerate heat better. With that being said, if you want to enjoy these vibrant flowering plants in your garden, choosing the right variety makes all the difference.
Beautiful Heat Tolerant Dahlia Varieties
Now that you know what it takes to successfully grow dahlias in warm climates, here are some heat-tolerant dahlia varieties that you can consider adding to your garden.
Bishop of Llandaff (USDA 8-10)
Not all dahlias are available in every color, but the Bishop of Llandaff is a variety that comes in a beautiful shade of red. With its almost black foliage that perfectly contrasts its scarlet blooms, those who live in warmer regions will be able to enjoy these blooms from summer until the first frost.
This beautiful variety can attract hummingbirds, bees, and butterflies to your garden while also being deer resistant.
Sweet Natalie (USDA 2-11)
Compared to the deep dark plum hue of the Bishop of Llandaff, the Sweet Natalie is a dahlia that has a more pinkish hue to its blooms. This particular variety is also known for being one of the longest bloomers, which means you’ll be able to enjoy its lovely flowers from early summer until late fall.
Its petals are also ruffled, giving it a more whimsical look that’s perfect for cottage gardens. During the summer, you’ll notice that its petals give off a more vibrant blush hue, making it a heat-tolerant dahlia that’s hard to resist.
Belle of Barmera (USDA 3-10)
For this particular variety, its blooms have a coral and orange hue perfect for adding a pop of color to any garden. The Belle of Barmera is also one of the tallest dahlias, with some plants reaching up to six feet. When the temperatures get warmer, you may notice that its blooms may get lighter in color but still just as beautiful.
Additionally, its petals may get thinner the hotter the temperature is. Despite this, the Belle of Barmera is still a heat-tolerant dahlia that gardeners from the South can enjoy.
Bracken Rose (USDA 3-10)
The Bracken Rose is a dahlia with ruffled petals that are a deep shade of pink. Sometimes, this flower shows a greenish hue in the center. When the temperatures get warmer, its blooms may lighten in color but still remain a beautiful shade of pink. Can survive under full sun, given enough water.
Additional Tips to Care for Your Dahlias During Summer
- Water more often when the temperature outside has reached 90 degrees Fahrenheit or above.
- Water in the morning, so the water has time to evaporate before the sun sets.
- When your dahlias are about to bloom, give them a good soaking to help the flowers open.
- Use a water hose to help cool down the dahlias during the afternoon. You may also use a drip irrigation system to give your plants quick short bursts throughout the day.
- Overhead watering is greatly encouraged, especially when temperatures reach 94 degrees Fahrenheit or higher.
- Ensure you have a shade cloth to protect your plants if you can’t plant your dahlias in an area with some afternoon shade. Garden umbrellas or other structures that can provide shade will also work.
Heat Tolerant Dahlias: Final Thoughts
Prized for their vibrant blooms, dahlias can simply bring a touch of whimsy and elegance to any outdoor space. While often found and grown in colder regions, there are some heat tolerant dahlias varieties that those who live in warmer climates can enjoy.
Choose a variety suitable for your climate, and don’t forget to consider some of the tips we’ve mentioned above. Many growers have had success with the varieties we’ve listed. So we know that you, too, can have a beautiful dahlia garden in the summer; even if you’re from the South!