Lobelia laxiflora var. angustifolia

RHS Plant Profile

narrow-leaved Sierra Madre lobelia

Synonyms

Lobelia angustifolia (A. DC.) Urbina

Herbaceous Perennial

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A herbaceous, woody-based, rhizomatous perennial to 60cm 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

Position

Full sun, Partial shade

Soil Types

Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.5-1 metres

Growing Conditions

Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Alkaline or Neutral

Position

Full sun Partial shade

Aspect: South–facing or West–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H3

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Campanulaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Bushy
Potentially harmful: Harmful if eatenskin irritant. Wear gloves and other protective equipment when handling Wear gloves and other protective equipment when handling. Pets: Harmful if eatenskin irritant. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
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: Arizona to Mexico

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

Cut back after flowering

Pests

May be susceptible to slugs

Diseases

May be susceptible to crown rot