Inula magnifica 'Sonnenstrahl'

RHS Plant Profile

inula 'Sonnenstrahl'

RHS 1999

Herbaceous Perennial

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'Sonnenstrahl' is a tall, free-flowering, upright perennial with ovate leaves and large yellow flower heads on branched, leafy stems in early summer

Position

Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.5-1 metres
Max Height: 1.5-2.5 metres

Growing Conditions

Chalk Clay Loam Sand

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

Position

Partial shade

Aspect: North–facing or West–facing or East–facing
Exposure: Exposed or 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): H6

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Asteraceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Bushy
Genus: Inula may be annuals, herbaceous perennials or sub-shrubs, moslty with large basal leaves and daisy-like yellow flower-heads, often with narrow ray-florets
Name Status: Accepted

How to Grow

Cultivation

Grow in a deep, fertile moist but well-drained soil in partial shade

Propagation

Propagate by seed in pots in a cold frame in spring or autumn. Propagate by division in spring or autumn

Suggested planting locations and garden types

Wildlife gardens
Cottage and informal garden
Wildflower meadow
Flower borders and beds

Pruning

Cut back after flowering

Pests

Generally pest-free

Diseases

May be susceptible to powdery mildews