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Herbaceous Perennial

Rudbeckia fulgida var. fulgida

black-eyed Susan

A clump-forming perennial, to around 1m high, with oval-shaped basal leaves, and branching stems bearing lance-shaped, slightly hairy, serrated stem leaves. Daisy-like flowers to 8cm across, with deep-brown central cones and golden yellow petals, are produced from late summer to early autumn

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Clay

Loam

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

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)

Botanical details

Family: Asteraceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Bushy, Clump forming
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, evenly moist soil; plants have some tolerance for 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 division of established clumps in autumn or spring

Suggested planting locations and garden types

Cottage and informal garden
Prairie planting
Wildlife gardens
City and courtyard gardens
Coastal
Gravel garden
Cut flowers
Flower borders and beds

Pruning

Deadhead regularly. Can be cut back in autumn, though stems and seedheads persist well and can provide structure in winter

Pests

May be susceptible to aphids, and to slugs on young growth

Diseases

May be susceptible to powdery mildews

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