Rudbeckia californica

RHS Plant Profile
California coneflower

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Herbaceous Perennial
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A bushy, clump-forming herbaceous perennial, up to 2m high, with broadly lance-shaped green leaves. Produces large, daisy-like flowerheads to 13cm across, with a prominent yellow-green central cone that turns brown as the flowers mature, and spreading yellow petals that become reflexed. Flowers are held singly on tall stems from mid to late summer

Position

Full sun, Partial shade

Soil Types

Clay, Loam

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

Clay Loam
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
South–facing or West–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, Columnar upright
Genus
Rudbeckia may be annuals, biennials or rhizomatous herbaceous perennials, with simple or pinnately divided leaves and large daisy-like flower-heads with yellow or orange rays surrounding a prominent conical disk
Name Status
Correct
Plant Range
USA (California)

How to Grow

Cultivation

Grow in moderately fertile soil that does not dry out. Will tolerate light shade but flowering is best in full sun. Divide every 3-5 years to maintain vigour. See rudbeckia cultivation for more detailed advice

Propagation

Propagate by seed or by division in spring

Suggested planting locations and garden types

  • Cottage and informal garden
  • Prairie planting
  • Wildflower meadow
  • Wildlife gardens
  • Flower borders and beds

Pruning

Spent flowering stems may be cut back, or left to provide winter interest

Pests

May be susceptible to aphids, to leaf and bud eelworms, and to slugs on young growth

Diseases

May be susceptible to powdery mildews, especially on dry soils