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Herbaceous Perennial

Lobelia laxiflora
  • RHS AGM

Sierra Madre lobelia

L. laxiflora is an herbaceous, woody-based, rhizomatous perennial to 90cm tall, with arching stems bearing long, very narrow leaves and 4cm long tubular red and yellow flowers singly in the upper leaf axils in late spring and summer

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Size
Ultimate height
0.5–1 metres
Time to ultimate height
2–5 years
Ultimate spread
1–1.5 metres
Growing conditions
Loam
Sand
Moisture
Moist but well–drained, Well–drained
pH
Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Red Yellow Green
Summer Red Yellow Green
Autumn
Winter
Position
  • Full sun
  • Partial shade
Aspect

South–facing or West–facing

Exposure
Sheltered
Hardiness
H3
Botanical details
Family
Campanulaceae
Native to the UK
No
Foliage
Deciduous
Habit
Bushy
Potentially harmful
Ingestion may cause severe discomfort, potential skin and eye irritant. Wear gloves and other protective equipment when handling
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

Name status

Correct

Plant range
SW USA to Colombia

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How to grow

Cultivation

Of borderline hardiness - protect with a dry winter mulch or lift and store in a frost-free greenhouse. Prefers to be grown in deep, fertile, reliably moist soil in full sun or partial shade

Propagation

Propagate by semi-ripe cuttings

Suggested planting locations and garden types
  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Flower borders and beds
Pruning

No pruning necessary, tidy up after flowering

Pests

Slugs may be a problem

Diseases

Crowns may rot in damp, mild conditions

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