Rudbeckia grandiflora

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Herbaceous Perennial

A tall, clump-forming herbaceous perennial, up to 1.8m high, with hairy stems and broadly lance-shaped, hairy green leaves. Produces large, daisy-like flowerheads, with a prominent grey-green central cone that turns brown as the flowers mature, and drooping yellow petals. Flowers are held singly on tall stems from mid to late summer

Position

Full sun, 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 or Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
East–facing or 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

How to Grow

Cultivation

Grow in moderately fertile soil, will tolerate some drought once established. 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