Dahlias Horticulture Dahlias Dahlias are popular additions to many gardens because of their versatility. They do well in gardens as bedding plants and as specimen plants in containers.
Dahlias also make excellent cut flowers.
Their flowers display a variety of sizes, shapes, and colors. There are both single-flowering and double flowering types. Fully grown dahlia plants range from one foot tall to over six feet in height. They may be bushy and filled with clusters of miniature or medium-sized flowers, or they may have two to four stalks bearing one to several very large blooms on each. The flowers measure from less than 2 inches to more than 8 inches in diameter.