Indian Summer Blackeyed Susan is a vibrant cultivar of Rudbeckia hirta that brings reliable summer color to gardens across zones 4 through 9. This frost-hardy annual reaches 36 to 42 inches tall, producing the classic golden-yellow petals and dark brown centers that make black-eyed Susans beloved in cottage gardens and mixed borders. Sow seeds indoors 8 to 10 weeks before your last spring frost, or direct sow 2 to 4 weeks before that date and again through mid-summer for continuous blooms into fall.
Full Sun
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4-9
42in H x ?in W
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Moderate
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Golden flowers with deep brown centers bloom generously over weeks in strong sunlight, thriving in the full sun and well-drained soil that most rudbeckias demand. The 36- to 42-inch height gives this variety real presence in a garden bed, unlike the more compact types. It tolerates frost and handles the heat of midsummer without complaint, making it a reliable performer from early summer through fall's first freeze.
Indian Summer Blackeyed Susan functions as a cut flower and a backbone plant in mixed perennial and annual borders. The tall, sturdy stems hold up well in arrangements, and the long bloom period from summer through fall makes it valuable for sustained color in garden beds and meadow-style plantings.
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Start seeds indoors 8 to 10 weeks before your average last spring frost date. Sow seeds by pressing them lightly into the surface (they need light to germinate) and maintain soil temperatures of 65 to 75 degrees Fahrenheit. Keep the soil consistently moist but not waterlogged. Seedlings will be ready to transplant when they reach 1 to 2 inches tall.
Transplant seedlings outdoors 8 to 10 weeks after indoor sowing, typically after your average last frost date has passed. Space plants 12 to 24 inches apart in full sun. Harden off seedlings gradually over 7 to 10 days before planting to acclimate them to outdoor conditions.
Direct sow seeds outdoors 2 to 4 weeks before your average last spring frost date. You can also sow as late as 2 months before your first fall frost date for autumn flowering. Press seeds into the soil surface without covering them, as they require light to germinate. Keep soil moist until seedlings establish.
Deadhead spent flowers regularly to promote continuous blooming and extend the flowering season. Cut back the entire plant by about one-third in mid-summer if growth becomes leggy or too tall for your garden plan.
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