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Great Blue Lobelia: Lobelia siphilitica

Great Blue Lobelia: Lobelia siphilitica

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Great Blue Lobelia
Lobelia siphilitica
 
A striking native perennial with vivid blue flower spikes that bring beautiful color to moist gardens in late summer. Great Blue Lobelia is an excellent choice for rain gardens, pond edges, woodland margins, and other areas with consistently moist soil.
 
Its distinctive tubular blue flowers grow along upright stems, attracting bumblebees and other pollinators. The rich blue blooms stand out beautifully among native grasses and late-season wildflowers, making Great Blue Lobelia a wonderful addition to wildlife-friendly gardens.
 
Growing Conditions:
  • Sun: Full sun to part shade; tolerates shade
  • Soil moisture: Medium to wet
  • Soil: Rich, moist soil; tolerates periodically saturated conditions
  • Height: 2–4 ft
  • Bloom time: Late summer to early fall
  • Flower color: Blue to violet-blue
  • Native range: Eastern and central North America
 
Wildlife Value:
  • Attracts bumblebees and other native bees
  • Provides nectar for flower-visiting insects
  • Supports late-season pollinators
  • Adds valuable flowering vegetation to moist habitats
 
Don't Worry If It Doesn't Flower Right Away:
Native perennials don't always flower their first year, and that's completely normal! Young plants often put much of their energy into developing a strong root system and establishing themselves in their new environment. Depending on the species, you may see limited or no flowering during the first growing season, with more substantial flowering beginning in year two and beyond.
 
Watering for Establishment:
For the best results, water your new plants regularly during their first 6 weeks after planting, particularly during periods of hot or dry weather. Great Blue Lobelia prefers consistently moist soil, especially while becoming established. Avoid allowing the soil to dry out completely during prolonged dry spells.
 
Plant for the future: The first year is about putting down roots. Give your native plants time to establish, and you'll be rewarded with stronger, more resilient plants in the seasons ahead.
 
Garden Use:
Great for rain gardens, pond edges, wet meadows, woodland margins, and moist native perennial beds. Its upright blue flower spikes pair beautifully with goldenrods, asters, and other late-season bloomers. Plant in groups to create a more noticeable display of blue flowers.
 
WNS Note:
Lobelia siphilitica is a valuable native perennial for adding vibrant color and pollinator resources to moisture-rich gardens. Its flowers are especially well suited to bumblebee pollination, and the plant may self-seed in favorable conditions, helping it maintain a presence in the garden over time.
 
Sourcing:
Seeds were sourced from Common Violets LLC, 8.1 ecoregion.
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