By Kat Yares, Garden Guides Contributor
About Dahlias
More than 36 species of flowering plants are considered Dahlias.
The dahlia plant can range in size from 1 foot to more than 8 feet
and can produce flowers that can be as small as 2 inches or as big
as 12 inches. Dahlia's are originally from Mexico and Central
America and were used by the Aztecs as a food source and as a
decorative plant.
Dahlia roots were sent from Mexico to the Netherlands in the late
1800s. Unfortunately only one root survived and from that root most
European varieties were grown. Dahlia flowers are the perfect cut
flower for home use.
Site Preparation
Dahlia tubers prefer a sandy, well draining soil with a pH between
6.2 and 6.5. Sand can be added to clay soil to help the plant
thrive.
Special Features
Cut dahlia flowers can last for up to a week indoors in a flower
arrangement. By growing a variety of different dahlias, an entire
arrangement can be made from dahlia flowers alone and provide both
large and small flowers for stunning results.
Choosing a Variety
Dahlia plants should be chosen based on their intended use in the
garden. Low growing plants can be used in borders or along
walkways, while the taller dahlias can be used for shading,
background flowers or stunning centerpieces.
Planting
Wait until all danger of frost has passed and plant dahlias in soil
that is at least 60 degrees. It is best not to plant dahlias during
the rainy time of spring as this can cause the tubers to rot. Dig
holes a foot deep and a foot wide and fill to a depth of 6 inches
with compost or other organic soil mixes. Lay the tuber in the hole
with the eye pointing upward. Pound in a stake beside the tuber if
planting a tall variety of dahlia. Cover the dahlia tuber with
approximately 2 inches of soil. When the sprouts begin to appear,
fill the hole an inch at a time until the hole is completely
filled. Use old pantyhose lengths or ripped sheeting to tie the
plant to the stakes as necessary.
Care
Water weekly until dahlias are well established. During hot, dry
periods, the dahlia should be watered twice or more a week if
necessary. In order to produce large blooms, select a few buds to
grow and remove any remaining buds. To keep the dahlia blooming
continuously during the growing season, remove spent buds
immediately.
If the dahlias are planted in USDA Zones 8 to 10, dahlia tubers can
be left in the ground over winter. Other zones should dig the
tubers in the fall before the first freeze. Divide the tubers
making sure each has an eye for the next year's growth. Store the
tubers in a dry area that is not subject to freezing. Check the
tubers several times over the winter for mold and shriveling.
