Black-eyed Susans (Rudbeckia hirta) are one of the easiest, most rewarding flowers to grow—especially in Tennessee. They’re drought-tolerant, pollinator-friendly, and thrive in heat and humidity.
Here’s a complete, practical growing guide:
Basic Plant Info
- Sun: Full sun (6–8+ hours)
- Height: 1–3 feet
- Bloom time: Late spring → fall
- Native: Yes (great for your area!)
When to Plant
- Transplant: April
How to Plant
Spacing
- 12–18 inches apart for good airflow
Soil & Location
- Prefers well-drained soil
- Tolerates poor soil (great for low-maintenance gardens)
- Ideal spots:
- Pollinator gardens
- Wildflower areas
- Along fences or borders
Watering
- Keep moist while establishing
- Once established: very drought tolerant
- Water deeply but infrequently
Care & Maintenance
Deadheading (optional)
- Encourages more blooms
- But leaving flowers = seeds for birds
Fertilizing
- Usually not needed
- Too much fertilizer = fewer flowers
Cutting back
- Cut back mid-season if plants get leggy to encourage bushier growth
Pollinator & Wildlife Benefits
- Attracts bees, butterflies, and beneficial insects
- Seeds feed birds in fall/winter
Perennial Behavior Tip
Even though Rudbeckia hirta is often short-lived:
- It reseeds easily
- You’ll often have plants year after year without replanting
Companion Plant Ideas (Great Together)
- Coneflower (Echinacea)
- Bee balm
- Yarrow
- Milkweed
- Native grasses
Common Problems
- Powdery mildew: Improve airflow, avoid overhead watering
- Floppy plants: Needs more sun or less fertilizer
- Overcrowding: Thin seedlings early
Harvesting (Cut Flowers)
- Cut when flowers are fully open
- Long vase life (7–10 days)
- Great for wildflower bouquets
Pro Tips for Tennessee Gardeners
- Let a few flowers go to seed → free plants every year
- Mix into wildflower beds for a natural look
- Excellent for low-water landscapes