Blue Heaven Windowbox Lobelia Flower Seeds

Blue Heaven lobelia produces a cascade of delicate, cerulean-blue blossoms that bring charm and vibrant color to gardens, patios, and balconies. This trailing annual is ideal for hanging baskets, window boxes, and container plantings, where its dainty flowers spill gracefully over the edges to create a soft, continuous display. Known for its weather resistance and long-lasting blooms, Blue Heaven lobelia flowers non-stop throughout the season, adding a consistent splash of cool-toned beauty to any outdoor space.

Thriving in full to partial sun, this lobelia variety prefers moderately fertile, well-drained soil and benefits from regular watering to maintain its lush growth. The compact plants reach a mature height of 6–7 inches, making them equally suitable for border plantings, rock gardens, or as an edging along pathways. With minimal maintenance, they reward gardeners with an abundant display from early summer through the first frost.

For best results, start seeds indoors in early spring, as they require warmth and light for germination. Transplant carefully once the danger of frost has passed, spacing seedlings about 5 inches apart to encourage healthy airflow and dense blooming. The charming color and graceful habit of Blue Heaven lobelia make it a versatile favorite for both decorative and pollinator-friendly plantings.

Discover more colorful and pollinator-friendly flowers in our Seeds Collection.

Scientific Name: Lobelia erinus
Planting Season: Spring
Soil Temperature: Above 50°F
Planting Depth: Extremely light
Germination: 14–21 days
Height at Maturity: 6–7"
Sun Requirements: Full to partial sun
Spacing After Thinning: 5"
Seed Count: Approx. 600–800
Weight: 100 mg