Aquilegia atrata, also known as the Dark Columbine, is a striking perennial known for its deep purple-black flowers and delicate, fern-like foliage. It adds a touch of elegance to woodland gardens, borders, and cottage-style landscapes.
Seed Treatment & Stratification
- Cold Stratify (Essential)
- Mix seeds with a small amount of moist sand or peat moss.
- Place in a sealed plastic bag and refrigerate at 35–40°F (2–4°C) for 4-6 weeks or longer.
- Important: If seedlings emerge in the bag, remove them immediately and plant them carefully into soil.
- Alternative Method: Sow outdoors in late fall so natural winter cold will stratify the seeds.
Germination Conditions
- Sowing Depth: Surface sow – press gently into moist soil but do not cover; seeds need light to germinate.
- Germination Temperature: 65–70°F (18–21°C) after stratification.
- Germination Time: Typically 21–56 days (AFTER stratification), but can take longer in some conditions. Be patient!
Sowing Indoors
- Best started indoors 6–8 weeks before last frost.
- Use seed trays with well-draining seed starting mix.
- Mist soil gently to keep evenly moist—not soggy.
- Provide bright indirect light or use a grow light.
- Transplant seedlings outdoors after the danger of frost has passed.
Outdoor Planting
- Choose a site with partial shade to full sun (shade preferred in hot climates).
- Prefers moist, well-draining soil rich in organic matter.
- Space plants 12–15 inches (30–38 cm) apart for airflow and growth.
Post-Germination & Care
- Water regularly but avoid waterlogging.
- Deadhead to encourage more blooms and reduce self-seeding.
- Let some flowers go to seed if naturalizing is desired.
- Mulch around plants to retain moisture and suppress weeds.