Black-Eyed Susan vs Butterfly Bush

Side-by-side plant comparison — which is right for your garden?

Black-Eyed Susan

Rudbeckia hirta

Asteraceae · flowers

Deer ResistantDrought TolerantLow Maintenance

Butterfly Bush

Buddleja davidii

Scrophulariaceae · shrubs

Deer ResistantDrought TolerantLow Maintenance

Hardiness Zone Range

Black-Eyed Susan (Zones 3-9)

Butterfly Bush (Zones 5-9)

Overlap: Both grow in zones 5–9

Detailed Comparison

Feature	Black-Eyed Susan	Butterfly Bush
Scientific Name	Rudbeckia hirta	Buddleja davidii
Family	Asteraceae	Scrophulariaceae
Category	flowers	shrubs
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Well-drained	Well-drained
Height	3'	10'
Spread	1' 6"	8'
Bloom Season	Summer-Fall	Summer-Fall
Bloom Color	Yellow	Purple, Pink, White
Growth Rate	Fast	Fast
Native Region	Eastern North America	China
Maintenance	Low	Low

Special Traits

Black-Eyed Susan

No — EdibleYes — Deer ResistantYes — Drought Tolerant

Butterfly Bush

No — EdibleYes — Deer ResistantYes — Drought Tolerant

Care Tips

Black-Eyed Susan

✓Deadhead spent blooms to encourage reblooming.
✓Divide clumps every 3-4 years.
✓Tolerates poor soil and drought once established.

Butterfly Bush

✓Cut back to 12-18 inches in early spring — blooms on new wood.
✓Deadhead for continuous flowering.
✓Can be invasive — choose sterile cultivars.
✓Full sun essential.

Which Plant Is Right for Your Garden?

Choose Black-Eyed Susan if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with medium water in zones 3–9.

Choose Butterfly Bush if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with medium water in zones 5–9.

Plant them together? Both overlap in zones 5–9. They share similar sun requirements (full sun), making them potential garden companions.

View Black-Eyed SusanProfile →View Butterfly BushProfile →

Frequently Asked Questions

Can Black-Eyed Susan and Butterfly Bush grow in the same hardiness zone?

Black-Eyed Susan grows in USDA zones 3-9, while Butterfly Bush grows in zones 5-9. Both plants can grow together in zones 5 through 9.

Do Black-Eyed Susan and Butterfly Bush have the same sun and water needs?

Black-Eyed Susan needs full sun and medium water, while Butterfly Bush needs full sun and medium water. They share similar growing requirements and can be planted in the same bed.

Which grows taller, Black-Eyed Susan or Butterfly Bush?

Butterfly Bush grows taller at 10' compared to Black-Eyed Susan at 3'. Butterfly Bush spreads 8' while Black-Eyed Susan spreads 1' 6".

Are Black-Eyed Susan and Butterfly Bush deer resistant?

Yes, both Black-Eyed Susan and Butterfly Bush are considered deer resistant, making them excellent choices for gardens in areas with deer pressure.

Which is easier to maintain, Black-Eyed Susan or Butterfly Bush?

Both Black-Eyed Susan and Butterfly Bush have low maintenance requirements. They need a similar level of care including regular attention to watering, pruning, and soil health.

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Detailed Comparison

Feature	Black-Eyed Susan	Butterfly Bush
Scientific Name	Rudbeckia hirta	Buddleja davidii
Family	Asteraceae	Scrophulariaceae
Category	flowers	shrubs
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Well-drained	Well-drained
Height	3'	10'
Spread	1' 6"	8'
Bloom Season	Summer-Fall	Summer-Fall
Bloom Color	Yellow	Purple, Pink, White
Growth Rate	Fast	Fast
Native Region	Eastern North America	China
Maintenance	Low	Low

Care Tips

Black-Eyed Susan

✓Deadhead spent blooms to encourage reblooming.
✓Divide clumps every 3-4 years.
✓Tolerates poor soil and drought once established.

Butterfly Bush

✓Cut back to 12-18 inches in early spring — blooms on new wood.
✓Deadhead for continuous flowering.
✓Can be invasive — choose sterile cultivars.
✓Full sun essential.

Which Plant Is Right for Your Garden?

Choose Black-Eyed Susan if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with medium water in zones 3–9.

Choose Butterfly Bush if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with medium water in zones 5–9.

Plant them together? Both overlap in zones 5–9. They share similar sun requirements (full sun), making them potential garden companions.

Frequently Asked Questions

Can Black-Eyed Susan and Butterfly Bush grow in the same hardiness zone?

Black-Eyed Susan grows in USDA zones 3-9, while Butterfly Bush grows in zones 5-9. Both plants can grow together in zones 5 through 9.

Do Black-Eyed Susan and Butterfly Bush have the same sun and water needs?

Black-Eyed Susan needs full sun and medium water, while Butterfly Bush needs full sun and medium water. They share similar growing requirements and can be planted in the same bed.

Which grows taller, Black-Eyed Susan or Butterfly Bush?

Butterfly Bush grows taller at 10' compared to Black-Eyed Susan at 3'. Butterfly Bush spreads 8' while Black-Eyed Susan spreads 1' 6".

Are Black-Eyed Susan and Butterfly Bush deer resistant?

Yes, both Black-Eyed Susan and Butterfly Bush are considered deer resistant, making them excellent choices for gardens in areas with deer pressure.

Which is easier to maintain, Black-Eyed Susan or Butterfly Bush?

Both Black-Eyed Susan and Butterfly Bush have low maintenance requirements. They need a similar level of care including regular attention to watering, pruning, and soil health.