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Annual BiennialHerbaceous Perennial

Rudbeckia triloba 'Blackjack Gold'

A bushy biennial or short-lived perennial to 1m tall, with dark red stems and roughly hairy leaves. From late summer into early autumn it bears a profusion of flowerheads to 5cm across, composed of golden yellow ray florets around a raised, black cones. This cultivar shows good disease-resistance, and its pollinator-friendly flowers are good for cutting

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Ultimate height

0.5–1 metres

Time to ultimate height

1–2 years

Ultimate spread

0.1–0.5 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

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
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: Unresolved

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. See rudbeckia cultivation

Propagation

Propagate by seed or division

Suggested planting locations and garden types

Cottage and informal garden
Prairie planting
Wildlife gardens
Low Maintenance
Cut flowers
Flower borders and beds

Pruning

Cut old stems back to ground level in early spring

Pests

May be susceptible to aphids

Diseases

Generally disease-free

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