Black-Eyed Susan vs Penstemon

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

Black-Eyed Susan

Rudbeckia hirta

Asteraceae · flowers

Deer ResistantDrought TolerantLow Maintenance

Penstemon

Penstemon digitalis

Plantaginaceae · flowers

Deer ResistantDrought TolerantLow Maintenance

Hardiness Zone Range

Black-Eyed Susan (Zones 3-9)

Penstemon (Zones 3-8)

Overlap: Both grow in zones 3–8

Detailed Comparison

Feature	Black-Eyed Susan	Penstemon
Scientific Name	Rudbeckia hirta	Penstemon digitalis
Family	Asteraceae	Plantaginaceae
Category	flowers	flowers
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧 Medium	💧 Low
Soil	Well-drained	Well-drained
Height	3'	3'
Spread	1' 6"	1' 6"
Bloom Season	Summer-Fall	Early Summer
Bloom Color	Yellow	White, Pink, Purple
Growth Rate	Fast	Medium
Native Region	Eastern North America	North America
Maintenance	Low	Low

Special Traits

Black-Eyed Susan

No — EdibleYes — Deer ResistantYes — Drought Tolerant

Penstemon

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.

Penstemon

✓Excellent drainage essential — root rot is the main killer.
✓Don't over-fertilize or overwater.
✓Cut back after first flush for possible rebloom.
✓Short-lived but self-seeds.

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 Penstemon if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with low water in zones 3–8.

Plant them together? Both overlap in zones 3–8. They share similar sun requirements (full sun), making them potential garden companions.

View Black-Eyed SusanProfile →View PenstemonProfile →

Frequently Asked Questions

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

Black-Eyed Susan grows in USDA zones 3-9, while Penstemon grows in zones 3-8. Both plants can grow together in zones 3 through 8.

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

Black-Eyed Susan needs full sun and medium water, while Penstemon needs full sun and low water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Black-Eyed Susan or Penstemon?

Both Black-Eyed Susan and Penstemon reach approximately 3' in height, with spreads of 1' 6" and 1' 6" respectively.

Are Black-Eyed Susan and Penstemon deer resistant?

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

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

Both Black-Eyed Susan and Penstemon 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	Penstemon
Scientific Name	Rudbeckia hirta	Penstemon digitalis
Family	Asteraceae	Plantaginaceae
Category	flowers	flowers
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧 Medium	💧 Low
Soil	Well-drained	Well-drained
Height	3'	3'
Spread	1' 6"	1' 6"
Bloom Season	Summer-Fall	Early Summer
Bloom Color	Yellow	White, Pink, Purple
Growth Rate	Fast	Medium
Native Region	Eastern North America	North America
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.

Penstemon

✓Excellent drainage essential — root rot is the main killer.
✓Don't over-fertilize or overwater.
✓Cut back after first flush for possible rebloom.
✓Short-lived but self-seeds.

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 Penstemon if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with low water in zones 3–8.

Plant them together? Both overlap in zones 3–8. They share similar sun requirements (full sun), making them potential garden companions.

Frequently Asked Questions

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

Black-Eyed Susan grows in USDA zones 3-9, while Penstemon grows in zones 3-8. Both plants can grow together in zones 3 through 8.

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

Black-Eyed Susan needs full sun and medium water, while Penstemon needs full sun and low water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Black-Eyed Susan or Penstemon?

Both Black-Eyed Susan and Penstemon reach approximately 3' in height, with spreads of 1' 6" and 1' 6" respectively.

Are Black-Eyed Susan and Penstemon deer resistant?

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

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

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