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Rudbeckia triloba

browneyed Susan add to wishlist

Plant types and subtypes: Perennials, Biennials

Light Requirements: sun, part-sun

Water Use: low, medium

Soil Moisture: dry, moist

Soil Description: rich, average, loam, clay, sand

Height: 2'-5'

Bloom Time: July, August, September

Bloom Color: yellow, orange

Leaf Color: green

Hardiness Zone: 4, 5, 6, 7, 8

Additional Tags: attracts bees, attracts birds, attracts butterflies, cottage garden plant, cut flowers, deer resistant, drought tolerant, naturalizing

Rudbeckia triloba (browneyed Susan)
  • Rudbeckia triloba (browneyed Susan)
  • Rudbeckia triloba (browneyed Susan)
  • Rudbeckia triloba (browneyed Susan)

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Description

Rudbeckia triloba

Also known as:

browneyed Susan

,

brown-eyed Susan

,

three-lobed coneflower

,

thin-leaved coneflower

Scientific Synonyms:

Description

Rudbeckia triloba is a stunning biennial, or short-lived perennial. It can grow to a height of 5', is multi-branched, and produces hundreds of daisy-like flowers. They are 1" to 2" across, with deep-yellow rays, and brown centers. The first year produces a dense basal rosette of broadly lanceolate, dentate leaves, that can be difficult to distinguish from other Rudbeckia species. It is not until the 2nd year that the lobed leaves, for which it earned the specific epithet triloba, emerge on the lower part of the stems. The upper leaves are smaller, and revert to a more lanceolate shape. The stems are robust, though they can flop over when grown in areas with less sun. They are covered with short, stiff hair, and have a rough texture.

Cultivation

Rudbeckia triloba might be short-lived, however it reseeds readily and will establish a perennial presence in the garden. It is very easy to, and low maintenance. It prefers full sun, but will tolerate some light shade. It is not very particular about soil and can withstand extended summer dry spells, although this might lead to the deterioration of the foliage. The blooming period can last up to 2 month, and can be further extended by dead-heading spent flowers. This is a good choice for a cottage garden, and makes for excellent cut flowers. It is also a good choice for large open areas and meadows, where its ability to self-seed will enable it to naturalize readily. Zone 4-8

Propagation

Easy to propagate from seed sown in spring or fall. Basal clumps can be divided in late summer, or early fall, of their 1st year. Can also be propagated from cuttings.

Additional Notes

Rudbeckia triloba is attractive to various pollinators, including many species of bees, bumblebees, and small to medium-sized butterflies. It can also be considered deer resistant.

Native Range & Classification

Recorded County Distribution: USDA data

Native Range:
AL, AR, CO, CT, DC, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, MI, MN, MO, MS, NC, NE, NJ, NY, OH, OK, PA, SC, TN, TX, UT, VA, VT, WI, WV

USDA Endangered Status:

  • Endangered: FL

Classification

Kingdom Plantae Plants
Subkingdom Tracheobionta Vascular plants
Superdivision Spermatophyta Seed plants
Division Magnoliophyta Flowering plants
Class Magnoliopsida Dicotyledons
Subclass Asteridae
Order Asterales
Family Asteraceae Aster family
Genus Rudbeckia coneflower
Species Rudbeckia triloba browneyed Susan