Destroy all infected plants as they appear, and control all sucking insects that can transmit viruses. Aphids and thrips are common and may cause young leaves to show puckering, curling or other abnormalities. Many shapes and colors are available. Plants grown from seeds will not grow true to type. Buy tuberous roots and save the roots each year for named cultivars.
Plants normally bloom from midsummer until frost.
Dahlias prefer full sun and a rich, well-drained soil. Keep them actively growing for best results with ample water and fertilization. Pinch out the tips of the main stems three weeks after planting to produce strong, bushy plants. Take off the faded blooms during the summer months to encourage continuous blooming. Tall dahlias will need staking.