Trailing Lobelia, also known as Edging Lobelia
Seed Treatment:
No stratification is required, but light is essential for germination, so do not cover the seeds.
To boost germination consistency, you may soak seeds in warm water for a few hours before sowing, though this is optional.
When to Sow:
Indoors: Start seeds 8–10 weeks before the last frost.
Outdoors: Sow after all danger of frost has passed (less common due to small seed size and need for controlled conditions).
Light Requirements:
Prefers full sun to partial shade.
In hot climates, provide afternoon shade to prolong blooming.
Soil Requirements:
Needs moist, rich, well-draining soil.
Ideal pH: 6.0–7.0
Sowing Instructions:
• Do not cover the seeds—surface sow only
• Gently press seeds into the surface of moist seed-starting mix
• Ideal temperature: 65–70°F (18–21°C)
• Maintain consistent humidity with a humidity dome or clear cover
• Germination in 14–20 days
Watering:
• Keep soil consistently moist, but not soggy
• Water gently or mist to avoid displacing seeds
Spacing:
• Thin or transplant seedlings 4–6 inches (10–15 cm) apart
Growing Tips:
• Produces masses of tiny flowers
• Perfect for hanging baskets, window boxes, containers, and borders
• May slow down in peak summer heat—cut back to refresh blooms
• Often grown as an annual, though perennial in frost-free zones
• Hardy in USDA Zones 10–11, typically grown as annual elsewhere