2019 is the Year of the Dahlia! These colorful, spiky, daisy-like flowers bloom from midsummer right through first frost, when many other plants are past their best. Plant bulbs in the springtime and prepare to be wowed! Learn more about dahlias, growing tips, and new varieties.
The National Garden Bureau has selected the beautiful dahlia as the bulb of the year.
Dahlia is a genus of tuberous plants that are members of the Asteraceae family; related species include the sunflower, daisy, chrysanthemum, and zinnia. They grow from small, brown, biennial tubers planted in the spring.
Picking a favorite dahlia is like going through a button box. As well as coming in a rainbow of colors, dahlia flowers can range in size from petite 2-inch lollipop-style pompoms to giant 15-inch “dinner plate” blooms. Most varieties grow 4 to 5 feet tall.
They are considered a tender perennial in cold regions North America. They are only winter hardy in planting zones 8 to 11. Gardeners in zones 2 to 7 can simply plant dahlia tubers in the spring and either treat them as annuals or dig them up and store for winter.
Dahlias love moist, moderate climates. Though not well suited to extremely hot climates (southern Florida or Texas), dahlias brighten up any sunny garden with a growing season that’s at least 120 days long.