These tubers prefer morning sunlight, and they can benefit from shade in the hottest hours of the afternoon. Check your hardiness zone at http://planthardiness. ars. usda. gov Dahlias do best in zones 8, 9 and 10, where they do not need to be dug up every winter. They do best in the Pacific Northwest of the United States. Dahlias can also be planted in colder zones with long, sunny summers.
If you want to combine them with other flowers in your flower beds, it is recommended that you choose small to medium varieties so they don’t compete too much with other plants.
Avoid using packaged topsoil that has been pre-treated for weeds. [4] X Research source
Smaller, bedding dahlias can be planted closer, approximately 9 to 12 inches (23 to 30 cm) apart.
If you live in a very dry climate, you can moisten the soil slightly before planting.
The water must reach a depth of at least 4 inches (10 cm). Some warmer, drier climates may require watering every other day.
Avoid fertilizing late in the season.
Place the cut flowers in hot water. Then, let them cool over the next hour. They should last 4 to 6 days. Cut your flowers in the morning for best results.
Dig up tubers in colder climates.
