Indian Summer Rudbeckia is an award-winning annual that brings the bold, sun-struck energy of native wildflowers to any garden. This cultivar produces gigantic golden flowers reaching 6-9 inches across on sturdy plants that grow 24-36 inches tall, blooming prolifically within 100-109 days from seed. Hardy in zones 3-9 and frost-tolerant, it thrives in full sun with minimal fussing, rewarding gardeners with blooms that are equally stunning in the garden or in a vase. Both an AAS Flower Winner and Fleuroselect Novelty Winner, Indian Summer has earned its reputation through rapid growth, ease of cultivation, and those dramatically oversized blooms that stop people in their tracks.
Photo © True Leaf Market
Growing Conditions
USDA Zone
3-9
Sunlight
Full Sun
Soil
Well-drained Loam, Tolerates Poor Soil
Preferred Temp60-85°F
Growth Stats
36 in
Height
—
Width
24 in
Spacing
100–109
Days to Harvest
PeriodAnnual, Biennial, Perennial
TypeForb/herb
Plant Profile
Sunlight
Full Sun
Water
—
Zones
3-9
Size
36in H x ?in W
Growth
Annual, Biennial, Perennial
Care
Moderate
Hover over chart points for details
Highlights
Golden flowers that sprawl across the landscape like miniature suns, reaching up to 9 inches across at maturity. Indian Summer grows with an effortless wildflower habit, needing just space and sun to perform spectacularly; it even reseeds on its own for self-perpetuating color year after year. The plants reach mid-height (24-36 inches), making them substantial enough to anchor a border without requiring staking, and they produce flowers reliably within 100-109 days from seed, whether you start them indoors or direct sow after frost danger passes.
Common Uses
Indian Summer Rudbeckia excels as a cut flower, with those enormous golden blooms commanding attention in arrangements. The flowers are equally valuable in the garden itself, where their cheerful presence brightens borders and attracts pollinators throughout the blooming season. The reseeding habit means gardeners can let them self-sow for spontaneous drifts of color in subsequent years.
Growing Timeline
First Bloom
Early Summer
First Harvest
N/a
Last Harvest
N/a
Care Instructions
Start Indoors
Sow seeds into 72 or 50-cell plug flats 5-7 weeks before your intended planting date. Cover seeds very lightly as light is essential for germination. Bottom water or mist gently to avoid displacing seed. Maintain soil temperature at 65-75°F for best germination rates.
Transplant Outdoors
Transplant seedlings outdoors after the last frost date has passed, when soil has warmed and nighttime temperatures stay reliably above frost levels. Space plants 24 inches apart (or closer at 12 inches if you prefer denser coverage). Harden off seedlings gradually over a week before planting to acclimate them to outdoor conditions.
Direct Sow
Direct seed after the last frost date has passed. Sow seeds lightly on the soil surface or cover very lightly, as light exposure aids germination. Keep soil consistently moist until seedlings emerge, then thin to appropriate spacing.
Harvesting
For cut flowers, harvest blooms before they are completely open for the longest vase life. For seed saving or allowing reseeding, leave blooms on the plant until they are completely open and petals begin to drop, then allow seeds to mature fully on the plant.
Pruning
No pruning is required; Indian Summer naturally develops a full, bushy form without pinching. Deadheading spent flowers encourages continued blooming, but allowing some late-season blooms to mature will result in reseeding for next year's display.
Growing Calendar
Enter your ZIP code to see a personalized growing calendar for this plant.
Companion Planting
Pests & Diseases
Ecology & Traits
Native Species
Scientific Classification
Rudbeckia hirta L.
Family
Asteraceae
Genus
Rudbeckia
Duration
Annual, Biennial, Perennial
Growth Habit
Bush
Native Status
L48 (N)AK (I)CAN (N)
History & Origin
“Indian Summer Rudbeckia represents the modern recognition of Rudbeckia hirta's garden value. This cultivar earned both the All-America Selections Flower Winner and Fleuroselect Novelty Winner awards, marking it as a breakthrough variety for its ability to grow rapidly and produce unusually massive blooms. The variety draws on the wildflower heritage of native black-eyed Susans while selecting specifically for size and vigor, creating a plant that performs with minimal coddling.”