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Lobelia siphilitica – Great Blue Lobelia

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Lobelia siphilitica – Great Blue Lobelia

Lobelia siphilitica, known as Great Blue Lobelia, is a native perennial that lights up the garden with its striking spikes of vivid blue flowers from late summer to fall. Ideal for adding color to moist areas, border fronts, or woodland gardens, it’s a favorite among bees, butterflies, and hummingbirds. This easy-to-care-for plant prefers moist, well-drained soil and partial to full sun, making it a versatile addition to any outdoor space. With its upright growth and captivating blooms, Great Blue Lobelia is perfect for gardeners looking to enhance their landscape’s beauty and support local wildlife.


Please note: Most pictures represent mature plants. Unless otherwise specified, all of our plants are sold in 4″ pots to make shipping possible and will mature in time.

Learn more about how the process works and how our plants are delivered.

Plant in 4" pot

Additional information


, ,


Single, 6-Pack, 9-Pack, Flat


Herbaceous Perennial

Native Range

Eastern North America


4, 5, 6, 7, 8, 9

Height Range (ft.)

2.00 to 3.00

Spread (ft.)

1.00 to 1.50

Bloom Time

August, July, September

Bloom Description



Full Sun, Part Shade


Medium, Wet



Suggested Use

Naturalize, Rain Garden


Deer, Heavy Shade, Wet Soil

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Product Description

Introducing Lobelia siphilitica, or Great Blue Lobelia, a distinguished native perennial celebrated for its spectacular display of deep blue flowers. As a late-summer bloomer, it provides a refreshing splash of color when many other plants begin to fade, making it a valuable addition to any garden.

Key Attributes of Great Blue Lobelia

  • Stunning Blue Flowers: The vibrant blue blooms of Great Blue Lobelia add a unique and captivating visual to garden settings, enriching the late-season landscape.
  • Attracts Pollinators: Its flowers are a vital nectar source for bees, butterflies, and hummingbirds, enhancing the garden’s ecological diversity.
  • Garden Versatility: Thrives in a variety of settings, including moist garden beds, borders, and woodland gardens, as well as rain gardens due to its preference for wetter conditions.
  • Ease of Care: This hardy perennial is relatively low maintenance, thriving in partial to full sun and preferring consistently moist, well-drained soil.

Growing Great Blue Lobelia

  • Sunlight Needs: Performs best in partial to full sun, with sufficient moisture.
  • Soil Requirements: Prefers rich, moist, well-drained soil but is adaptable to a range of soil types.
  • Watering Regimen: Keep the soil consistently moist to ensure optimal growth and flowering.
  • Spacing Considerations: Plant about 18 inches apart to allow for natural spreading and airflow between plants.

Designing with Great Blue Lobelia

Great Blue Lobelia’s upright form and vivid blue flowers make it an excellent choice for adding height and color to borders, creating stunning contrasts in mixed perennial beds, or naturalizing in woodland or rain garden settings. Its ability to thrive in moist conditions also makes it suitable for planting along pond edges or in other wet areas of the garden.

Environmental Impact

By incorporating Great Blue Lobelia into your garden, you’re not only enriching your outdoor space with beauty but also contributing to the health of the local ecosystem by providing essential resources for pollinators.

Embrace the beauty and ecological benefits of Great Blue Lobelia in your garden. With its eye-catching blue flowers and affinity for attracting wildlife, it’s an ideal plant for those looking to add both visual appeal and biodiversity to their landscape.


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Summer Shipping Concerns

Please expect some delays in shipping during summer months!

Shipping perishable items in the heat of summer can be tricky to say the least. Our goal is to try to get your plants to you in the best shape possible.

This means we may hold off on shipping items during periods of excessively high temperatures to give your new plants the best chance of surviving their journey in good shape.