Plant dahlias in full sun
Use well-draining soil
Space plants properly for airflow
Water deeply 2 to 3 times per week
Keep soil consistently moist but not soggy
Mulch around plants to retain moisture
Stake tall varieties early
Pinch back young plants to encourage bushiness
Deadhead spent flowers regularly
Fertilize with a low-nitrogen fertilizer every few weeks
Remove damaged or diseased foliage
Watch for pests such as aphids, slugs, and spider mites
Divide tubers in spring if needed
Dig up tubers after the first frost in cold climates
Store tubers in a cool, dark, dry place over winter