Penstemon vs Sweet Pea

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

Penstemon

Penstemon digitalis

Plantaginaceae · flowers

Deer ResistantDrought TolerantLow Maintenance

Sweet Pea

Lathyrus odoratus

Fabaceae · flowers

Deer ResistantMedium Maintenance

Hardiness Zone Range

Penstemon (Zones 3-8)

Sweet Pea (Zones 2-11)

Overlap: Both grow in zones 3–8

Detailed Comparison

Feature	Penstemon	Sweet Pea
Scientific Name	Penstemon digitalis	Lathyrus odoratus
Family	Plantaginaceae	Fabaceae
Category	flowers	flowers
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧 Low	💧💧 Medium
Soil	Well-drained	Rich, Well-drained
Height	3'	6'
Spread	1' 6"	1'
Bloom Season	Early Summer	Spring-Summer
Bloom Color	White, Pink, Purple	Mixed
Growth Rate	Medium	Fast
Native Region	North America	Italy, Sicily
Maintenance	Low	Medium

Special Traits

Penstemon

No — EdibleYes — Deer ResistantYes — Drought Tolerant

Sweet Pea

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Care Tips

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.

Sweet Pea

✓Soak seeds overnight before planting.
✓Provide trellis or netting.
✓Pick flowers frequently to prolong bloom.
✓Needs cool weather — plant early spring or fall in warm areas.

Which Plant Is Right for Your Garden?

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.

Choose Sweet Pea if you don't mind medium maintenance, and want deer resistance. It thrives in full sun with medium water in zones 2–11.

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

View PenstemonProfile →View Sweet PeaProfile →

Frequently Asked Questions

Can Penstemon and Sweet Pea grow in the same hardiness zone?

Penstemon grows in USDA zones 3-8, while Sweet Pea grows in zones 2-11. Both plants can grow together in zones 3 through 8.

Do Penstemon and Sweet Pea have the same sun and water needs?

Penstemon needs full sun and low water, while Sweet Pea needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Penstemon or Sweet Pea?

Sweet Pea grows taller at 6' compared to Penstemon at 3'. Sweet Pea spreads 1' while Penstemon spreads 1' 6".

Are Penstemon and Sweet Pea deer resistant?

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

Which is easier to maintain, Penstemon or Sweet Pea?

Penstemon has low maintenance while Sweet Pea has medium maintenance. Penstemon may be easier for beginning gardeners to manage.

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Detailed Comparison

Feature	Penstemon	Sweet Pea
Scientific Name	Penstemon digitalis	Lathyrus odoratus
Family	Plantaginaceae	Fabaceae
Category	flowers	flowers
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧 Low	💧💧 Medium
Soil	Well-drained	Rich, Well-drained
Height	3'	6'
Spread	1' 6"	1'
Bloom Season	Early Summer	Spring-Summer
Bloom Color	White, Pink, Purple	Mixed
Growth Rate	Medium	Fast
Native Region	North America	Italy, Sicily
Maintenance	Low	Medium

Care Tips

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.

Sweet Pea

✓Soak seeds overnight before planting.
✓Provide trellis or netting.
✓Pick flowers frequently to prolong bloom.
✓Needs cool weather — plant early spring or fall in warm areas.

Which Plant Is Right for Your Garden?

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.

Choose Sweet Pea if you don't mind medium maintenance, and want deer resistance. It thrives in full sun with medium water in zones 2–11.

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 Penstemon and Sweet Pea grow in the same hardiness zone?

Penstemon grows in USDA zones 3-8, while Sweet Pea grows in zones 2-11. Both plants can grow together in zones 3 through 8.

Do Penstemon and Sweet Pea have the same sun and water needs?

Penstemon needs full sun and low water, while Sweet Pea needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Penstemon or Sweet Pea?

Sweet Pea grows taller at 6' compared to Penstemon at 3'. Sweet Pea spreads 1' while Penstemon spreads 1' 6".

Are Penstemon and Sweet Pea deer resistant?

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

Which is easier to maintain, Penstemon or Sweet Pea?

Penstemon has low maintenance while Sweet Pea has medium maintenance. Penstemon may be easier for beginning gardeners to manage.