Grown for its beautiful flowers, this plant is classified into 14 groups based on blossom type. They come in all colors except the elusive blue. Dahlia plants are hardy in warmer regions, but can be saved year after year in colder areas by digging up their large, tuberous roots in the fall and replanted in the spring.
Dahlias bloom nonstop summer until frost in a rainbow of colors. As cut flowers, they will last several days, making them excellent for homegrown bouquets. A few of the most exciting flower types include the cactus form with its needlelike petals and the ball (or pompom) types that have small, spherical blossoms. Dinner plate dahlias have enormous blooms that can measure nearly a foot across. And some cultivars have burgundy foliage that provides a pretty backdrop for the showy flowers.
Dahlia Care Must-Knows
Dahlias grow equally well in the ground or containers. If you purchase them as bare-root tubers, start them indoors early in the spring for a head start on the growing season. To do this: Plant the tubers in a pot of well-drained potting soil about six weeks before the last frost; place the pots in a sunny window and keep warm. Keep the soil evenly moist, but not wet to avoid rot. Once the foliage emerges and the danger of frost has passed, plant in the ground.
When choosing where to use dahlias in the landscape, consider the mature height of the plant. Some large varieties, including the dinner plate dahlia, require staking or tall neighbors to support the heavy flowers. Dwarf and small varieties don't require additional support.
Using a low nitrogen fertilizer helps to increase their prolific blossoms. Full sun encourages more upright plants that need less staking, but these plants will still flower in part shade. If planted in shadier areas, the foliage tends to look greener than burgundy on dark-leaved cultivars.
Related: 5 Little-Known Facts About Dahlias
If you are planning on saving your dahlias for the next growing season, take these steps: About two weeks after the first frost of the season has hit and the foliage has dropped, cut stems off at the ground and dig up the tubers. Be sure to dig carefully because the tubers can be fragile and may break into pieces. Wash excess dirt from roots and allow to dry. Store tubers in slightly damp peat moss or sawdust in a cool, dark place. Come spring, you will have tubers ready to plant for another year of showy flowers.
More Varieties of Dahlia
'Arabian Night' offers deep maroon, almost black, blooms that open several to a stem and grows 3 feet tall. Zones 8-10
This variety bears dark fiery-red blooms shaped like small peonies that glow against deep chocolate foliage. This prize-winning dahlia grows to 50 inches tall. Zones 8-10
Dahlia 'Radar' is a large, informal decorative-type that features deep plum-purple petals tipped in white. It grows 5 feet tall. Zones 8-10
Dahlia 'Chinese Lantern' bears huge, bittersweet orange blooms that appear abundantly on branching stems from midsummer to fall. It grows 3 to 4 feet tall. Zones 8-10
'Jessica' is a cactus-type dahlia that unfurls butter-yellow petals tipped in flame red. It grows 5 feet tall. Zones 8-10
This type of dahlia features medium-size red blooms tipped in white. It grows 3 feet tall. Zones 8-10
'Penn's Gift' is known for its large pink flowers that can reach more than 1 foot across. It grows 5 feet tall. Zones 8-10
Dahlia 'Pam Howden' is an abundantly blooming variety that features 2- to 4-inch-wide water-lily style flowers in an orange-yellow-coral blend. The plant grows 4 feet tall. Zones 8-10
Dahlia Star Gazer Series is a dwarf, cactus-flowered dahlia that produces spiky blooms in nine colors, including golds, yellows, deep reds, fuchsia, lavender, and bicolors with white. The multibranching plants grow 16 inches tall. Zones 8-10
Dahlia 'Victory Dwarf' is a small, single-flowered variety that produces gemlike blooms in red, orange, yellow, and white. It grows to 8 inches tall. Zones 8-10
This variety of Dahlia is a semicactus-type dahlia with spiky light lavender petals unfolding from a creamy white center. It grows 5 feet tall. Zones 8-10
'White Fawn' offers pristine white blooms, up to 4 inches across, on a plant that grows 4 feet tall. Zones 8-10
Dahlia 'SB's Sunny' is an award-winning variety that features layers of lemon yellow petals tightly clustered on a round, pom-pom flower. It grows 4 feet tall. Zones 8-10
This type offers cherry-red flowers with an iridescent pink overtone bloom on dark stems. It grows 4 feet tall. Zones 8-10