About
Lobelia siphilitica Hillview Blue is a clump-forming perennial to about 90cm, with sturdy, upright, leafy stems beari.
About the genus
Lobelia can be annuals, perennials or shrubs, with simple leaves and showy 2-lipped flowers that may be solitary or in racemes or panicles
Growing conditions
SunlightFull sun, Partial shade
Soil typeChalk, Clay, Loam, Sand
Soil pHAcid, Alkaline, Neutral
Soil moistureMoist but well-drained
AspectEast-facing, South-facing, West-facing
ExposureExposed, Sheltered
UK hardinessH5
Plant details
Plant typeHerbaceous Perennial
HabitClump forming
FoliageDeciduous
Height0.5-1 metres
Spread0.1-0.5 metres
Time to full height2-5 years
Suggested usesCity and courtyard gardens, Cottage and informal garden
ToxicityHarmful if eaten, skin irritant. Wear gloves and other protective equipment when handling Wear gloves and other protective equipment when handling. Pets: Harmful if eaten, skin irritant. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Care notes
CultivationPlant in deep, fertile, reliably moist soil in sun or partial shade. Protect the crown of the plant over winter with a thick, dry mulch
PruningCut down faded flower spikes in late autumn
PropagationPropagate by division
Pest resistanceMay be susceptible to slugs and snails
Disease resistanceMay be susceptible to crown rot and a leaf spot