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Lobelia siphilitica

For sale by Lewis Cottage Plants

This grower is sure of this plant identification.

Spikes of 2ft high blue flowers appear from mid summer to early autumn. Leaves are light green and up to 4″ long. This hardy perennial can be short lived unless divided every other year. H&S 24″x12″

Pot SizeTotal Price
2 litres

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Plant Finder: about Lobelia siphilitica


Lobelia siphilitica. This perennial produces racemes of 2-lipped violet-blue flowers in late summer and autumn. They are borne on 2-3 foot stalks.


These frost-hardy to somewhat frost-tender plants are best grown in well-drained, moist, light loam enriched with animal manure or compost. Most grow in sun or part-shade but resent wet conditions in winter. Prune after the first flush of flowers to encourage repeat flowering, and fertilize weekly with a liquid manure during the season.

Interest and use

Border, rock garden, wildflower/meadow, container, bog Attracts humming birds in suitable geographical locations.

Italics = data drawn from parent genus or species

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Lobelia siphilitica | Devon, EX17 | Copyright Greenplantswap 2019
  • LightFull sun
  • HardinessFully hardy (min -15°C)
  • SoilHeavy, Well drained
  • Soil pH7.0
  • WaterMoist

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