Wildflowers Active during the day

sweet black-eyed Susan

Rudbeckia subtomentosa

iNaturalist Wikipedia

Famed for its sweet anise scent and golden-yellow blooms, the sweet black-eyed Susan is a cornerstone of the American prairie and a favorite for backyard pollinators.

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0 Habitats

Quick Identification

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Size

3 to 5 feet (90–150 cm) tall with a spread of 1 to 2 feet (30–60 cm)

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Colors

Bright yellow to gold ray florets with reddish-brown bases; dark brownish-purple center disks; grayish-green foliage

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Key Features

Sweet anise or vanilla fragrance from the crushed leaves and flowers
Finely haired (subtomentose) stems and leaves providing a velvety feel
Lower leaves are deeply divided into three lobes
Flower heads feature 12–20 yellow petals surrounding a dark, dome-shaped center

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 9 AM - 5 PM

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Season July-September

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Diet Photosynthetic; requires full sun and moist, well-drained soil rich in organic matter

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Habitat Native prairies, moist meadows, open woodlands, stream banks, and suburban pollinator gardens

public Geographic range

Where Does the sweet black-eyed Susan Live?

Native to the heart of North America, the sweet black-eyed Susan is primarily found throughout the central United States. Its core range extends from the Great Lakes region southward through the Mississippi Valley to the Gulf Coast, with high concentrations in states like Missouri, Illinois, and Arkansas. While it is a specialist of the tallgrass prairie ecosystem, it has been successfully introduced to managed landscapes and meadow restorations across much of the eastern United States.

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1 Countries

2.1M km² Range

Least Concern Conservation

US United States

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iNaturalist / Verified observation data

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Behavior

Sweet black-eyed Susan is a long-lived perennial that brings structure and late-season color to the landscape. Unlike many other Rudbeckia species that act as short-lived biennials, this plant establishes a deep root system and returns reliably year after year. It is known for its sturdy, upright stems that rarely require staking, even when fully loaded with blooms during its peak season from late July through September.

In the wild, it serves as a critical late-summer nectar source for a diverse array of pollinators, including long-tongued bees, butterflies, and skippers. Humans prize it not just for its visual appeal but for its unique fragrance—a subtle, sweet scent reminiscent of anise or clover that wafts through the garden on warm, humid afternoons. It is a social plant in the ecosystem, often found growing in tight-knit colonies that provide excellent cover for ground-nesting birds.

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Camera Tips

Capturing the sweet black-eyed Susan on a trail camera is all about focusing on the 'micro-wildlife' it attracts. To get the best shots of visiting butterflies and bees, mount your camera on a garden stake approximately 3 to 4 feet off the ground, positioning it about 2 feet away from a cluster of healthy blooms. Use a macro lens attachment if available, or set your camera to its closest focus setting to capture the intricate details of the pollinators' wings against the bright yellow petals.

Lighting is your best friend with this species. Aim your camera toward the east or west to take advantage of the 'golden hour' light, which makes the yellow petals glow and highlights the fine, silvery hairs on the stems. If your camera has a high-speed trigger or a 'burst mode,' enable it; this is essential for freezing the motion of fast-moving insects like the clearwing hummingbird moth, which is a frequent visitor to these flowers.

For a unique perspective, try a time-lapse setting over a period of 4 to 6 hours during a sunny day. This will capture the subtle movement of the flower heads tracking the sun and the constant bustle of pollinator activity. In the late fall, don't take your camera down; the dried, dark seed heads are a magnet for American Goldfinches, providing a great opportunity to capture bird behavior in the 'off-season.'

Similar Species

Species that look similar or are commonly confused with sweet black-eyed Susan.

Black-eyed Susan

Shorter lived (biennial), lacks the anise scent, and has simple, unlobed leaves covered in much coarser hairs.

Brown-eyed Susan

Produces much smaller flower heads in greater numbers and typically has more branched, shrub-like growth.

Orange Coneflower

Features deeper orange-yellow petals and lacks the fuzzy 'subtomentose' texture on the stems.

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Frequently Asked Questions

The plant is most 'active' in terms of pollinator visits during the warmest parts of the day, typically from mid-morning to late afternoon (10 AM to 4 PM), when nectar production is at its peak and the sun is high.

You can attract this species by planting nursery-grown starts or seeds in a spot with full sun and consistent moisture. They are less prone to drought stress than other Rudbeckias, so keeping the soil 'mesic' (moderately moist) is key to their success.

As a plant, it creates its own food through photosynthesis. It thrives best in soil that is rich in organic matter (humus) and has a neutral pH, absorbing nitrogen, phosphorus, and potassium through its root system.

Yes, they are becoming increasingly popular in suburban 'pocket prairies' and rain gardens because they are taller and more perennial than the common black-eyed Susan, making them great for backyard borders.

Look at the leaves and smell the flowers. Sweet black-eyed Susan has three-lobed lower leaves and a distinct anise-like fragrance when the foliage is crushed, features that the common Rudbeckia hirta lacks.

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