Alphabetical Plant Listing

Rudbeckia subtomentosa (Sweet Coneflower)

Sweet Coneflower, Sweet Black-Eyed Susan, Fragrant Coneflower.


A tough prairie plant, Rudbeckia subtomentosa (Sweet Coneflower) is a clump-forming perennial boasting masses of butter-yellow, daisy-like flowers, 2-3 in. across (5-7 cm), adorned with dark chocolate central cones. Blooming from mid summer to frost, they are borne on branched stems, creating a lovely floral bouquet, and emit a pleasant sweet anise fragrance - thus the common name. Heat and humidity tolerant, Sweet Coneflower retains its lush deep green foliage and showy blooms in the intense heat of summer when others may struggle. Sweet Coneflower is more long-lived than Rudbeckia hirta (Black-eyed Susan) and Rudbeckia triloba (Brown-eyed Susan) and will persist in the garden for many years. It is taller than Rudbeckia hirta and its flower heads are larger with longer and more abundant ray petals than Rudbeckia triloba.

  • Grows up to 3-6 ft. tall (90-180 cm) and 2-3 ft. wide (60-90 cm).
  • Thrives in full sun, in average, medium moisture, well-drained soils. Heat, humidity, clay soils, dry soils and drought tolerant. Provide good air circulation to avoid powdery mildew.
  • Spectacular when massed in drifts, this is an excellent choice for perennial borders, cottage gardens or naturalizing areas such as prairies or wildflower meadows. The flowers make excellent and long-lasting fresh cut flowers.
  • Low maintenance and pest-free, it is also deer resistant.
  • Deadhead spent flowers to promote additional bloom. Cut back in fall.
  • Native to the central United States.

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Requirements

Hardiness 3 – 8
Plant Type Perennials
Plant Family Rudbeckias
Exposure Full Sun
Season of Interest Summer (Mid,Late)
Fall
Height 3' – 6' (90cm – 180cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 24" – 36" (60cm – 90cm)
Water Needs Average
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Cut Flowers, Showy
Native Plants United States, Midwest, Illinois, Indiana, Iowa, Kansas, Missouri, Wisconsin, Northeast, Connecticut, Massachusetts, New York, Southeast, Arkansas, Kentucky, Louisiana, Mississippi, North Carolina, Tennessee, Southwest, Oklahoma, Texas
Tolerance Clay Soil, Deer, Drought, Dry Soil
Attracts Birds, Butterflies
Garden Uses Beds and Borders
Garden Styles Informal and Cottage, Prairie and Meadow

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By AppleDK / Shutterstock

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 3 – 8
Plant Type Perennials
Plant Family Rudbeckias
Exposure Full Sun
Season of Interest Summer (Mid,Late)
Fall
Height 3' – 6' (90cm – 180cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 24" – 36" (60cm – 90cm)
Water Needs Average
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Cut Flowers, Showy
Native Plants United States, Midwest, Illinois, Indiana, Iowa, Kansas, Missouri, Wisconsin, Northeast, Connecticut, Massachusetts, New York, Southeast, Arkansas, Kentucky, Louisiana, Mississippi, North Carolina, Tennessee, Southwest, Oklahoma, Texas
Tolerance Clay Soil, Deer, Drought, Dry Soil
Attracts Birds, Butterflies
Garden Uses Beds and Borders
Garden Styles Informal and Cottage, Prairie and Meadow

Great Plant Combination Ideas with Rudbeckias

Guides with Rudbeckias

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