Decorative bi-color dahlia bulbs—technically tuberous roots—produce large, fully double flowers with striking, multi-toned petals. Varieties like the Duet (red and white) or Labyrinth (pink and peach) are beloved for their rich contrasts. They grow best in full sun (6-8 hours daily) and rich, well-drained soil. [1, 2, 3, 4, 5]
How to Grow Bi-Color Dahlias
- Planting: Plant after the last frost once soil is warm. Dig a 6-inch deep hole, lay the tuber horizontally with the eye (growing point) facing up, and cover with 2-3 inches of soil.
- Watering: Do not water immediately after planting to avoid rot. Wait until sprouts appear, then keep the soil consistently moist.
- Support: Tall decorative varieties require staking as they grow.
- Bloom Time: Expect vibrant blooms from mid-summer through the first autumn frost.
- Winter Care: In frost-prone regions, carefully dig up the tubers in late fall and store them in a cool, dark place over winter. [1, 2, 3, 4, 5]
