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Table of Contents
Fundamental Black Dahlia Facts
| Scientific Name | Dahlia spp. |
| Common Aliases | Black Dahlia and Dark Dahlia |
| Pet Safe? | No |
| Toxicity | Toxic to pets and humans if ingested. |
| USDA Hardiness Zone | 8-11 |
| Beneficial Species Pairings | Marigolds and Lavender |
| Growth Rate | Moderate |
| Mature Size | 3-4 feet (0.9-1.2 meters) high, 1-2 feet (0.3-0.6 meters) wide |
Black Dahlia Care Requirements
| Light Requirements | Full sun, at least 6 hours of direct sunlight daily |
| Temperature Range | 60-70°F (15-21°C) from Spring through Fall |
| Repotting Frequency | Every 1-2 years or when the plant outgrows its pot |
| Soil Type | Rich, well-drained soil |
| Soil pH | pH 6.0-7.0 (neutral to slightly acidic) |
| Preferred Humidity Level | Moderate humidity |
| Watering Frequency | Water regularly to keep the soil moist. |
| Preferred Watering Methods | Give the plant a good soaking once the top inch of soil becomes dry |
| Air Circulation | Good airflow to prevent fungal disease |
| Fertilizer Types | Balanced, water-soluble fertilizer |
| Fertilizing Frequency | Every 2-4 weeks during the growing season (Spring-Fall) |
| Terrarium Plant? | No |
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Black Dahlia Notable Needs
| Signs of Dormancy |
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| Seasonal Care Adjustments | Lift and store tubers if kept outdoors in colder climates (before the first frost) |
| Support Requirements | Staking may be necessary for taller varieties |
| Pruning Requirements | Deadhead spent blooms to encourage flowering |
| Cleaning Requirements | Remove dead and diseased foliage promptly |
| Pests to Watch For | Aphids, Spider Mites, and Slugs |
| Potential Diseases | Powdery Mildew, Botrytis blight, and Root rot from overwatering |
Black Dahlia Propagation
| Propagation by Division | Yes |
| Division Timing | Early Spring |
| Division Steps |
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| Propagation by Stem Cuttings | Yes |
| Stem Cuttings Timing | Early Spring (once the tubers begin to sprout) |
| Stem Cuttings Steps |
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| Propagation Notes | Ensure the new growth is strong before transplanting or the shock could be detrimental. |
Where to Buy Black Dahlia Seeds
Recommended Soil Mix
Miracle-Gro Organic Raised Bed & Garden Soil with Quick Release Natural Fertilizer, Peat Free, 1 cu. ft., 2-Pack
- Miracle-Gro Organic Raised Bed & Garden Soil is a soil blend with quick release natural fertilizer
- Feeds plants for up to 2 months
- This organic soil blend is peat free and formulated with upcycled green waste