Overview
Rudbeckia (Rudbeckia spp.), commonly called Black-Eyed Susan, is one of the most beloved and dependable North American natives. It produces golden-yellow daisy flowers with dark central cones from midsummer well into fall. 'Sweet as Honey' is a compact variety (12–16 inches) with abundant medium-sized blooms and excellent branching. Rudbeckia is incredibly adaptable, thriving in heat, humidity, and a wide range of conditions.
Sun & Exposure
- Ideal: Full sun (6+ hours daily)
- Tolerated: Part shade — will still bloom but may be slightly taller and more open
- Very heat and humidity tolerant — performs well across most of the US
Watering
Moderately drought tolerant once established.
- Water regularly during the first season to establish
- Established plants tolerate dry spells well
- Water during extended drought to maintain best performance
- Tolerates brief wet periods better than many perennials
Soil & Planting
- Tolerates poor to average, well-draining soil — adapts to a wide range of conditions
- Slightly acidic to neutral pH (6.0–7.0)
- Plant in spring or fall; space 18–24 inches apart
- One of the most adaptable perennials for difficult sites
Fertilizing
- Minimal feeding needed in average soil
- A light balanced fertilizer application in early spring is sufficient
- Overly rich soil causes floppy growth
Pruning & Deadheading
- Deadhead spent blooms to extend flowering
- Leave seed heads standing in fall and winter — goldfinches and other birds feed on them extensively
- Cut back to the ground in early spring before new growth emerges
Winter Care
Hardy in zones 3–9. Extremely reliable and winter-hardy. Self-seeds moderately to freely depending on variety — thin seedlings in spring if needed.
Common Issues
Problem
Powdery mildew in late summer
Cause
Common; not fatal, cosmetic only
Problem
Floppy stems
Cause
Too much shade or overly fertile soil
Problem
Excessive self-seeding
Cause
Normal; deadhead before seeds mature to control
Tips
- One of the most important late-season plants for pollinators
- Seed heads provide critical winter food for goldfinches and sparrows
- Excellent cut flower — lasts well in a vase
- Pairs naturally with ornamental grasses, Echinacea, and Gaillardia
- 'Sweet as Honey' compact habit is ideal for containers and smaller borders
Frequently Asked Questions
Q: Does black-eyed Susan spread?
A: Yes, Rudbeckia spreads in two ways: the clump slowly expands over time, and it self-seeds moderately. If you want to control spread, deadhead before seeds fully mature. Self-seeding is usually welcome — it helps fill in naturalistic plantings.
Q: Is rudbeckia deer resistant?
A: Rudbeckia has moderate deer resistance. Deer may occasionally browse young plants but generally leave established clumps alone. It is more resistant than many other perennials.
Q: When does rudbeckia bloom in Erie?
A: In Erie, black-eyed Susan typically starts blooming in late July and continues through September and into October. It's one of the most important flowers for late-season pollinators in the region.