1 / 3Key characteristics
- Height
- 4 to 5 ft
- Bloom size
- Large (8‑10 in)
- Flower color
- Dark red
- Days to maturity
- 80 to 100 days
- Light
- Full Sun
- Plant spacing
- 12-18 inches
Dahlias
Dahlia 'AC Big Iron'
AC Big Iron Dahlia
Dahlia 'AC Big Iron' features lush, dark-red blooms held in the informal decorative form, defined by relaxed, layered petals that create a full, open flower head. Each blossom has a rich, velvety red tone that intensifies toward the center, creating a deepened core that enhances the flower's overall depth and richness. Blooms appear in midsummer and continue through the first frosts of autumn, bringing consistent color throughout the season.
Availability
Many tubers and seeds are available online. For help in finding online sources, visit dahliaaddict.com.
Planting & care
Growing beautiful dahlias starts with thoughtful planting and care. A sunny location, well-draining soil, and consistent attention throughout the growing season help plants develop abundant flowers. Regular watering and feeding encourage healthy growth, while mulch helps conserve moisture. Removing spent flowers keeps plants blooming freely from summer into fall.
Read the complete dahlia guideMore dahlias

Dahlia 'Dutch Carnival'
Dutch Carnival Dahlia
Blooms maroon-red with golden yellow edges

Dahlia 'Awaikoe'
Awaikoe Dahlia
Blooms dark red / burgundy with white petal collar
Full Sun

Dahlia 'Nighty Night'
Nighty Night Dahlia
Blooms dark red, almost black‑red

Dahlia 'Rock Star'
Rock Star Dahlia
Blooms dark wine‑red petals with a pincushion of deep red florets