Overview
Rudbeckia triloba is a bushy, clump forming perennial in the genus Rudbeckia, part of the Asteraceae family, with deciduous foliage. Rudbeckia triloba grows best in full sun and partial shade, and tolerates most soils and neutral and slightly acidic pH. Its UK hardiness is rated H4. Suggested uses include wildflower gardens, naturalized areas and borders. It is native to Colorado, Missouri, South Carolina, District of Columbia, Alabama, Louisiana, Maryland and Ohio.
About
Rudbeckia triloba, the browneyed or brown-eyed susan, thin-leaved coneflower or three-leaved coneflower, is a species of flowering plant in the family Asteraceae with numerous, yellow, daisy-like flowers. It is native to the central and eastern United States and is often seen in old fields or along roads.
Wikipedia contributors, CC BY-SA 4.0 — Rudbeckia triloba
About the genus
Rudbeckia is a plant genus in the Asteraceae or composite family. Rudbeckia flowers feature a prominent, raised central disc in black, brown shades of green, and in-between tones, giving rise to their familiar common names of coneflowers and black-eyed-susans. All are native to North America, and many species are cultivated in gardens for their showy yellow or gold flower heads that bloom in mid to late summer.
Wikipedia contributors, "Rudbeckia", CC BY-SA 4.0 — Rudbeckia
Growing conditions
Best soil and position for Rudbeckia
- Sunlight
- full sun, partial shade
- Soil type
- well-drained, loamy, sandy
- Soil pH
- neutral, slightly acidic
- Soil moisture
- moist, well-drained
- Aspect
- south, east
- Exposure
- open
- UK hardiness
- H4
Plant details
Rudbeckia triloba size, habit and characteristics
- Plant type
- perennial
- Habit
- Bushy, Clump forming
- Foliage
- Deciduous
- Suggested uses
- wildflower gardens, naturalized areas, borders
- Native to
- Colorado, Missouri, South Carolina, District of Columbia, Alabama, Louisiana, Maryland, Ohio
Care notes
Pruning and caring for Rudbeckia triloba
- Cultivation
- easily grown in average, medium moisture, well-drained soils in full sun to part shade
- Pruning
- deadhead to prolong flowering
- Propagation
- seed, division
- Pest resistance
- Aphids, Slugs
- Disease resistance
- Powdery mildews
Frequently asked questions
How do I grow Rudbeckia triloba?
Easily grown in average, medium moisture, well-drained soils in full sun to part shade.
Where is the best place to plant Rudbeckia triloba?
Rudbeckia triloba prefers full sun and partial shade. It suits open positions.
What soil does Rudbeckia triloba need?
Rudbeckia triloba is adaptable and grows happily in most soil types, including well-drained, loamy and sandy. It prefers neutral and slightly acidic soil. Aim for soil that stays moist to well-drained.
How do I prune Rudbeckia triloba?
Deadhead to prolong flowering.
Is Rudbeckia triloba hardy in the UK?
Rudbeckia triloba has an RHS hardiness rating of H4, meaning it is hardy through an average UK winter, tolerating -10 to -5°C.
How do I propagate Rudbeckia triloba?
Seed, division.
From the Fenn Plants journal
- Notes on DaffodilsWhen to plant daffodil bulbs in the UK, how deep, how to naturalise them in grass, why daffodils stop flowering (“blindness”), and why you should never mix cut daffodils with other flowers.
- Keeping Your NerveHow to garden through a heatwave — the best time to water, why deep soaks beat daily sprinkles, caring for pots and vulnerable plants, and why you can let the lawn go brown.
- Made to LastHow to clean, store and protect garden pots and planters — the frost-proof vs frost-resistant difference, winter care for terracotta and ceramic, and how to reuse a broken pot.
More in the Rudbeckia genus
- Rudbeckia fulgidablack-eyed Susan
- Rudbeckia fulgida 'Goldsturm'Black-eyed Susan
- Rudbeckia fulgida var. deamiiDeam's coneflower
- Rudbeckia fulgida var. sullivantiiSullivant's coneflower
- Rudbeckia laciniatacut-leaved coneflower
- Rudbeckia laciniata 'Golden Glow'Golden Glow
- Rudbeckia mollisSoft Rudbeckia
- Rudbeckia nitidashining coneflower
