Product Description 

Lobelia siphilitica, known as Great Blue Lobelia, is a moisture‑loving perennial that produces vibrant blue flower spikes from late summer into autumn. Flowering from August to October, it brings strong colour when many pond plants are fading and provides valuable nectar for bees and butterflies.

This clump‑forming perennial develops upright stems with lance‑shaped foliage, adding height and structure to pond margins, streamsides, bog gardens, and damp borders. Fully hardy across the UK, it thrives in consistently moist or wet soils and grows well in full sun or partial shade.

Great Blue Lobelia is ideal for wildlife ponds, naturalistic planting schemes, and rain gardens where reliable moisture is available.

Key Features

• Tall blue flower spikes from August–October
• Moisture‑loving perennial for pond margins and boggy soils
• Height: 30–90 cm; Spread: up to 40 cm
• Hardy perennial suitable for UK climates
• Highly attractive to pollinators
• Clump‑forming with strong vertical interest
• Ideal for wildlife ponds, rain gardens, and damp borders

Care & Planting Instructions

• Plant in moist to wet soil at the pond edge or in boggy ground.
• Position in full sun to partial shade.
• Keep soil consistently moist; do not allow to dry out.
• Remove spent flower spikes in late autumn.
• Divide clumps in spring if rejuvenation is needed.
• Note: Harmful if eaten; skin irritant — handle with care.

Measurements

• Height: 30–90 cm
• Spread: up to 40 cm
• Flowering: August–October
• Growth Rate: Moderate
• Position: Full sun–part shade
• Soil: Moist–wet, fertile

🌱 Companion Plant Suggestions

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Marginals & Bog Plants

• Iris versicolor
• Pontederia cordata
• Butomus umbellatus ‘Schneeweisschen’
• Mentha aquatica

Oxygenators

• Ceratophyllum demersum
• Elodea canadensis

Floating Plants

• Frogbit (Hydrocharis morsus‑ranae)
• Water Soldier (Stratiotes aloides)