Rudbeckia Summerina Sizzling Sunset ('Et Rdb 621') (Summerina Series)

RHS Plant Profile

coneflower [Summerina Sizzling Sunset]

Synonyms

Rudbeckia 'Et Rdb 621'

Herbaceous Perennial

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A compact, clump-forming herbaceous perennial, to around 50cm high, with lance-shaped, slightly toothed, rough green leaves. Daisy-like flowers to 15cm across are produced from mid summer to autumn, with a dark brown central cone, a ring of burnt orange in the centre, and golden yellow tips to the petals

Position

Full sun, Partial shade

Soil Types

Clay, Loam

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 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): H5

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: 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: Trade

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. May need protection in cold winters. See rudbeckia cultivation for more detailed advice

Propagation

Propagate by division in spring

Suggested planting locations and garden types

Cottage and informal garden
Patio and container plants
Prairie planting
Wildflower meadow
Wildlife gardens
Cut flowers
Flower borders and beds

Pruning

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

Pests

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

Diseases

May be susceptible to powdery mildews, especially on dry soils