Indian Summer, Rudbeckia Seeds

Indian Summer Black-Eyed Susan Seed

Extra-large golden blooms command attention in every planting
Six-to-nine-inch flowers surround rich chocolate-brown centers
Tall branching stems excel for cutting and pollinators
Heat-tolerant plants flower from summer into fall

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Key Attributes

Botanical Name

Rudbeckia hirta

Days to maturity

115 Days

Sun

Full Sun

Packet

50 Seeds

Zones 3–9 Check your growing zone

About Indian Summer, Black-Eyed Susan Seed, Black-Eyed Susan Seed

Indian Summer Rudbeckia (Rudbeckia hirta), an award-winning variety of Black-Eyed Susan, is cherished for its brilliant, long-lasting blooms and adaptability in the garden. First popularized in the late 20th century, this hardy annual or short-lived perennial produces extra-large daisy-like flowers—often 6–9 inches across—with golden-yellow petals surrounding dark chocolate-brown centers. Plants grow 3–4 feet tall with sturdy, branching stems, making them excellent for borders, pollinator gardens, and cut flower arrangements.

Growing details

Planting

Sow Depth

1/4"

Days to Germination

7–21 days

Germination Type

C30 - Cold Moist 30 Days

In-row plant spacing

18"

Plant profile

Life Cycle

Perennial

Hardiness Zone

Zones 3-9

Plant Height

48 inches

Growth Habits

Clumping, Upright

Seed & variety

Seeds Per Ounce

62,250

Color

Yellow

Seed Type

Open Pollinated

Before Planting

Select full sun and ordinary, well-drained soil for black-eyed Susan. Remove perennial weeds, avoid rich manure, and cold-stratify seed when required by the species or seed source.

Planting

Surface-sow black-eyed Susan indoors 8–10 weeks before the last frost. Many perennial strains germinate more uniformly after about 4 weeks of cold-moist stratification; annual Rudbeckia may not require it. Maintain 65–70°F with light, harden seedlings, and transplant 12–18 inches apart. Fall sowing provides natural chilling.

Watering

Water seedlings regularly during establishment. Mature plants tolerate moderate drought, but a deep soaking during prolonged dry weather extends flowering; let crowns drain and keep foliage dry overnight.

Fertilizer

Top-dress lightly with compost in spring. Fertilizer is unnecessary in most beds, and excess nitrogen leads to tall, floppy stems with fewer flowers.

Harvesting

Cut black-eyed Susans when ray petals are fully expanded but the dark center remains tight and pollen has not begun shedding heavily. Harvest sturdy stems early in the day and place them into water. Leave selected seed heads standing for birds or collect them after they dry.

Tips

Leave some late seed heads for finches while removing others to limit volunteers. Divide perennial clumps when crowded, and stake only unusually tall plants or those grown in partial shade.

Pests & Diseases

Septoria leaf spot, powdery mildew, rust, Botrytis blight, and Verticillium wilt can affect black-eyed Susan. Watch for dark spotted leaves, white coating, orange pustules, gray mold, or progressive wilting. Space plants generously, water at soil level, remove infected leaves and fall debris, rotate beds, and discard plants with persistent vascular wilt.

Lace bugs cause pale stippling and dark specks beneath black-eyed Susan leaves; aphids, Japanese beetles, and leafhoppers also feed on plants. Check leaf undersides first. Remove plants with aster-yellows distortion, handpick beetles, and preserve predators that help suppress lace bugs and aphids.