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Great Blue Lobelia

Lobelia Siphilitica

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Overview

Great Blue Lobelia (Lobelia siphilitica) is a striking perennial bestowing spires of vibrant indigo blue flowers. Ideal for adding vertical interest, this North American native thrives in USDA zones 4-9, prefers moist, well-draining soils, and partially shaded sites. It grows up to 2-3 feet tall and spreads about 1-1.5 feet wide. Blooming from late summer to early fall, it attracts butterflies and hummingbirds, enhancing garden biodiversity.

Sun Full, HalfWater Extra in Summer, MediumZones 4–9Type PerennialClimate Temperate
Great Blue Lobelia (Lobelia Siphilitica) — creating a dense floral display that is highly attractive to butterflies; perennial with blue blooms
Great Blue Lobelia (Lobelia Siphilitica) — enhancing garden biodiversity; blue flowers in the garden, image 55Great Blue Lobelia (Lobelia Siphilitica) — creating a dense floral display that is highly attractive to butterfliesGreat Blue Lobelia (Lobelia Siphilitica) — Ideal for adding vertical interestGreat Blue Lobelia (Lobelia Siphilitica) — enhancing garden biodiversity; blue flowers in the gardenGreat Blue Lobelia (Lobelia Siphilitica) — This low-maintenance perennial is also relatively deer resistant; lobelia siphilitica prefers consistently moist toGreat Blue Lobelia (Lobelia Siphilitica) — It grows up to 2-3 feet tall and spreads about 1-1.5 feet wide; ideal for adding vertical interest+72

Culture

Sun
Full, Half
Water
Extra in Summer, Medium
USDA zones
4–9

Shape & size

Classification

Type
Perennial
Family
Campanulaceae
Climate
Temperate

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Photos (79)

Great Blue Lobelia (Lobelia Siphilitica) — creating a dense floral display that is highly attractive to butterflies; perennial with blue blooms
Great Blue Lobelia (Lobelia Siphilitica) — enhancing garden biodiversity; blue flowers in the garden, image 55
Great Blue Lobelia (Lobelia Siphilitica) — creating a dense floral display that is highly attractive to butterflies
Great Blue Lobelia (Lobelia Siphilitica) — Ideal for adding vertical interest
Great Blue Lobelia (Lobelia Siphilitica) — enhancing garden biodiversity; blue flowers in the garden
Great Blue Lobelia (Lobelia Siphilitica) — This low-maintenance perennial is also relatively deer resistant; lobelia siphilitica prefers consistently moist to
Great Blue Lobelia (Lobelia Siphilitica) — It grows up to 2-3 feet tall and spreads about 1-1.5 feet wide; ideal for adding vertical interest
Great Blue Lobelia (Lobelia Siphilitica) — perennial for full or half
Great Blue Lobelia (Lobelia Siphilitica) — and partially shaded sites
Great Blue Lobelia (Lobelia Siphilitica) — They cling closely to upright
Great Blue Lobelia (Lobelia Siphilitica) — is a striking herbaceous perennial native to the eastern and central regions of the United States, image 57
Great Blue Lobelia (Lobelia Siphilitica) — It grows up to 2-3 feet tall and spreads about 1-1.5 feet wide; ideal for adding vertical interest, image 52
Great Blue Lobelia (Lobelia Siphilitica) — it attracts butterflies and hummingbirds
Great Blue Lobelia (Lobelia Siphilitica) — this plant makes an eye-catching addition to any garden with its deep blue to violet flowers
Great Blue Lobelia (Lobelia Siphilitica) — blue flowers in the garden
Great Blue Lobelia (Lobelia Siphilitica) — and partially shaded sites; and its striking blooms add late-season color when many other plants are, image 51
Great Blue Lobelia (Lobelia Siphilitica) — it attracts butterflies and hummingbirds; and other pollinators.<br><br>The foliage of this species is, image 54
Great Blue Lobelia (Lobelia Siphilitica) — and its striking blooms add late-season color when many other plants are fading
Great Blue Lobelia (Lobelia Siphilitica) — adding functional benefits to its ornamental appeal
Great Blue Lobelia (Lobelia Siphilitica) — this plant makes an eye-catching addition to any garden with its deep blue to violet flowers; this North American
Great Blue Lobelia (Lobelia Siphilitica) — this North American native thrives in USDA zones 4-9; this plant makes an eye-catching addition to any garden with
Great Blue Lobelia (Lobelia Siphilitica) — measuring about 1 inch in length
Great Blue Lobelia (Lobelia Siphilitica) — and its striking blooms add late-season color when many other plants are fading; and partially shaded sites
Great Blue Lobelia (Lobelia Siphilitica) — this North American native thrives in USDA zones 4-9
Photographs by 12 contributors

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