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Please click here for latest ordering information. We are having to implement a daily restriction in order numbers due to demand. We are short staffed, so the phone is not being answered as quickly as normal. We are despatching your orders as fast as possible, however there may be a delay of up to two weeks. UK orders only no exports.

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Last updated 06/4/20 13:35.

'L' > LOBELIA > siphilitica >

LOBELIA siphilitica

Commonly known as Blue cardinal flower

Clear blue

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Blue - clear blue
Height - 60-120cm (24-48in)
Spread - 30cm (12in)
Herbaceous - Early in the year, typically January till end of March, herbaceous plants might be supplied in 9cm pots to ensure timely despatch. - clump- forming perennial with erect, leafy stems. Toothed leaves can be oval, broadly lance-shaped or oblong. They are 10-15cm (4-6in) long, light-green and softly hairy. Produces long-lasting, tubular, 2-lipped flowers 2.5-3.5cm (1-1½in) across in dense racemes 10-50cm (4-20in) long.
Hardy - average winter - Hardy through most of the UK apart from inland valleys, at altitude and central/northerly locations. May suffer foliage damage and stem dieback in harsh winters in cold gardens. Plant can withstand temperatures down to -10°C (14°F)
Full sun
Partial shade
Caution, toxic if eaten, may cause skin allergy or irritant - These plants are toxic if eaten and may also cause a skin allergy, rash, irritation to eyes and skin.
Additional Features - Pests & Diseases - slugs, leaf blotch.
Place of origin - eastern USA.
Hardiness - Frost hardy (down to -5) -
Seasonal Interest - Summer
Soil Conditions - Fertile moist well-drained soil