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Rudbeckia subtomentosa

Common Name(s):

Phonetic Spelling
rud-BEK-ee-a sub-toh-men-TOH-suh
Description

Rudbeckia subtomentosa, or Sweet coneflower, is a herbaceous perennial in the daisy family. Sweet coneflower prefers medium moisture, well-drained loam or sandy loam and full or partial sun. However, it is an easy going plant and tolerates hot and humid summers, some drought, clay soil, and is deer resistant. It does like good air circulation and, to encourage additional blooming, you should deadhead spent flowers. Also, the tall stalks may require some support, especially if the plant is grown in a shady area or given too much water or fertilizer. It is a good choice for rain gardens, borders, cottage gardens and naturalized areas. Sweet coneflower will grow to 3 to 5 feet tall and display daisy-like, 3 inch, yellow flowers with dark brownish-purple center disks on branched stems. The flowers faintly smell of anise, hence the common name.

Diseases, Insects, and Other Plant Problems:

No known serious insect or disease problems. Powdery mildew may appear. Taller plants may need support, particularly if grown in part shade.

See this plant in the following landscapes:
Four-Season Garden
Cultivars / Varieties:
  • Henry Eilers
    Blossoms are rolled instead of straight
Henry Eilers
Tags:
#rain garden#drought tolerant#wildlife plant#native perennial#cottage garden#cpp#deer resistant#naturalizes#borders#wildflower garden#larval host plant#butterfly friendly#pollinator garden#wavy-lined emerald butterfly#silvery checkerspot butterfly
 
Cultivars / Varieties:
  • Henry Eilers
    Blossoms are rolled instead of straight
Henry Eilers
Tags:
#rain garden#drought tolerant#wildlife plant#native perennial#cottage garden#cpp#deer resistant#naturalizes#borders#wildflower garden#larval host plant#butterfly friendly#pollinator garden#wavy-lined emerald butterfly#silvery checkerspot butterfly
  • Attributes:
    Genus:
    Rudbeckia
    Species:
    subtomentosa
    Family:
    Asteraceae (daisy)
    Life Cycle:
    Perennial
    Recommended Propagation Strategy:
    Seed
    Country Or Region Of Origin:
    central United States
    Wildlife Value:
    This is a larval host plant for Silvery Checkerspot (Chlosyne nycteis) caterpillars which have one brood in the north and two broods from May-September in the rest of its range. The adults feed on nectar from red clover, common milkweed, and dogbane. Bees and other polinators are attracted by the pollen and nectar of the flowers. Caterpillars of various butterfly species also feed on the plant. This plant also supports Wavy-lined Emerald (Synchlora aerata) larvae.
    Particularly Resistant To (Insects/Diseases/Other Problems):
    Moderately deer resistant.
    Dimensions:
    Height: 3 ft. 0 in. - 5 ft. 0 in.
    Width: 1 ft. 0 in. - 2 ft. 0 in.
  • Whole Plant Traits:
    Plant Type:
    Native Plant
    Perennial
    Wildflower
    Habit/Form:
    Erect
    Growth Rate:
    Medium
    Maintenance:
    Low
    Texture:
    Coarse
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Partial Shade (Direct sunlight only part of the day, 2-6 hours)
    Soil Texture:
    Clay
    High Organic Matter
    Loam (Silt)
    Sand
    Soil Drainage:
    Good Drainage
    NC Region:
    Coastal
    Mountains
    Piedmont
    USDA Plant Hardiness Zone:
    4a, 4b, 5b, 5a, 6a, 6b, 7a, 7b, 8b, 8a
  • Flowers:
    Flower Color:
    Gold/Yellow
    Flower Value To Gardener:
    Fragrant
    Good Cut
    Long Bloom Season
    Flower Bloom Time:
    Fall
    Summer
    Flower Petals:
    7 - 20 petals/rays
    Flower Size:
    1-3 inches
    Flower Description:
    Yellow rays and brownish purple center disks. The central disks of the flowerheads are fragrant after being crushed.
  • Leaves:
    Leaf Color:
    Green
    Leaf Feel:
    Rough
    Leaf Shape:
    Lanceolate
    Leaf Margin:
    Dentate
    Lobed
    Hairs Present:
    Yes
    Leaf Length:
    > 6 inches
    Leaf Width:
    3-6 inches
    Leaf Description:
    Grey green leaves, toothed, downy on the bottom.
  • Stem:
    Stem Color:
    Green
    Stem Is Aromatic:
    No
    Stem Surface:
    Hairy (pubescent)
    Stem Description:
    Light green, terete, and sometimes slightly furrowed; they are covered with spreading hairs
  • Landscape:
    Landscape Location:
    Meadow
    Naturalized Area
    Landscape Theme:
    Butterfly Garden
    Cottage Garden
    Pollinator Garden
    Rain Garden
    Attracts:
    Bees
    Butterflies
    Pollinators
    Resistance To Challenges:
    Deer
    Drought
    Poor Soil