Butterfly Weed vs Penstemon

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

Butterfly Weed

Asclepias tuberosa

Apocynaceae · flowers

Deer ResistantDrought TolerantLow Maintenance

Penstemon

Penstemon digitalis

Plantaginaceae · flowers

Deer ResistantDrought TolerantLow Maintenance

Hardiness Zone Range

Butterfly Weed (Zones 3-9)

Penstemon (Zones 3-8)

Overlap: Both grow in zones 3–8

Detailed Comparison

Feature	Butterfly Weed	Penstemon
Scientific Name	Asclepias tuberosa	Penstemon digitalis
Family	Apocynaceae	Plantaginaceae
Category	flowers	flowers
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧 Low	💧 Low
Soil	Well-drained, Sandy	Well-drained
Height	2' 6"	3'
Spread	1' 6"	1' 6"
Bloom Season	Summer	Early Summer
Bloom Color	Orange	White, Pink, Purple
Growth Rate	Medium	Medium
Native Region	Eastern North America	North America
Maintenance	Low	Low

Special Traits

Butterfly Weed

No — EdibleYes — Deer ResistantYes — Drought Tolerant

Penstemon

No — EdibleYes — Deer ResistantYes — Drought Tolerant

Care Tips

Butterfly Weed

✓Deep taproot — don't transplant.
✓Direct sow or plant young.
✓Late to emerge in spring — mark location.
✓Monarch caterpillar host plant.

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 Butterfly Weed if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with low water in zones 3–9.

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 Butterfly WeedProfile →View PenstemonProfile →

Frequently Asked Questions

Can Butterfly Weed and Penstemon grow in the same hardiness zone?

Butterfly Weed grows in USDA zones 3-9, while Penstemon grows in zones 3-8. Both plants can grow together in zones 3 through 8.

Do Butterfly Weed and Penstemon have the same sun and water needs?

Butterfly Weed needs full sun and low water, while Penstemon needs full sun and low water. They share similar growing requirements and can be planted in the same bed.

Which grows taller, Butterfly Weed or Penstemon?

Penstemon grows taller at 3' compared to Butterfly Weed at 2' 6". Penstemon spreads 1' 6" while Butterfly Weed spreads 1' 6".

Are Butterfly Weed and Penstemon deer resistant?

Yes, both Butterfly Weed and Penstemon are considered deer resistant, making them excellent choices for gardens in areas with deer pressure.

Which is easier to maintain, Butterfly Weed or Penstemon?

Both Butterfly Weed 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	Butterfly Weed	Penstemon
Scientific Name	Asclepias tuberosa	Penstemon digitalis
Family	Apocynaceae	Plantaginaceae
Category	flowers	flowers
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧 Low	💧 Low
Soil	Well-drained, Sandy	Well-drained
Height	2' 6"	3'
Spread	1' 6"	1' 6"
Bloom Season	Summer	Early Summer
Bloom Color	Orange	White, Pink, Purple
Growth Rate	Medium	Medium
Native Region	Eastern North America	North America
Maintenance	Low	Low

Care Tips

Butterfly Weed

✓Deep taproot — don't transplant.
✓Direct sow or plant young.
✓Late to emerge in spring — mark location.
✓Monarch caterpillar host plant.

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 Butterfly Weed if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with low water in zones 3–9.

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 Butterfly Weed and Penstemon grow in the same hardiness zone?

Butterfly Weed grows in USDA zones 3-9, while Penstemon grows in zones 3-8. Both plants can grow together in zones 3 through 8.

Do Butterfly Weed and Penstemon have the same sun and water needs?

Butterfly Weed needs full sun and low water, while Penstemon needs full sun and low water. They share similar growing requirements and can be planted in the same bed.

Which grows taller, Butterfly Weed or Penstemon?

Penstemon grows taller at 3' compared to Butterfly Weed at 2' 6". Penstemon spreads 1' 6" while Butterfly Weed spreads 1' 6".

Are Butterfly Weed and Penstemon deer resistant?

Yes, both Butterfly Weed and Penstemon are considered deer resistant, making them excellent choices for gardens in areas with deer pressure.

Which is easier to maintain, Butterfly Weed or Penstemon?

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