Lobelia siphilitica (Great Blue Lobelia)

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A late-summer star for moist garden borders, Lobelia siphilitica sends up upright spikes of vivid blue, tubular flowers from late summer into early autumn in New Zealand. The blooms are a magnet for bees and butterflies, standing out against narrow, deep green foliage that forms a tidy clump. Originally native to North America’s damp meadows and streambanks, this hardy perennial thrives in similar moisture-retentive conditions and naturalistic plantings.

Grows to around 80 cm tall and 30–45 cm wide. Easy to divide in winter or early spring when clumps enlarge over time.

Mildly toxic.

Growing conditions:

• Full sun to part shade

• Prefers moist, well-drained soil

• Frost hardy throughout NZ

• NZ flowering period: Late summer to early autumn

Uses:

• Great for rain gardens, pond edges, or mixed perennial borders

• Excellent for attracting bees and butterflies

• Can naturalise and very easy to divide and reproduce.

1L pot.

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