Seed Treatment
- Mix seeds with moist sand, vermiculite, or paper towel.
- Place the mix in a sealed plastic bag.
- Refrigerate at 35–40°F (1–4°C) for 4–6 weeks.
- After stratification, sow seeds indoors or directly outdoors in early spring.
You can also direct sow in late fall for natural winter stratification.
When to Sow
- Indoors: 6–8 weeks before your last frost date
- Outdoors: Early spring or late fall
Soil Requirements
- Well-draining, moderately fertile soil
- Works well in sandy, loamy, or light clay soils
- Ideal pH: 6.0–7.5
Light Requirements
- Full sun to partial shade
- Provide light afternoon shade in hot climates
Sowing Depth
- Surface sow; do not cover or only lightly dust with fine soil or vermiculite
- Press seeds gently into the soil to ensure contact
Watering
- Keep soil evenly moist during germination
- Mist gently to avoid washing away surface seeds
Germination Time
- 14–28 days at 65–70°F (18–21°C)
Spacing
- Thin or transplant seedlings to 12–18 inches (30–45 cm) apart
Growing Tips
Campanula glomerata produces vibrant clusters of bell-shaped violet-blue flowers in early to midsummer. It’s great for borders, cottage gardens, and pollinator patches. Deadhead to extend flowering and reduce self-seeding. Plants are deer-resistant and attract pollinators. Cut back after flowering to promote a tidy appearance and fresh foliage.