Astilbe vs Sweet Pea

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

Astilbe

Astilbe × arendsii

Saxifragaceae · flowers

Deer ResistantLow Maintenance

Sweet Pea

Lathyrus odoratus

Fabaceae · flowers

Deer ResistantMedium Maintenance

Hardiness Zone Range

Astilbe (Zones 4-8)

Sweet Pea (Zones 2-11)

Overlap: Both grow in zones 4–8

Detailed Comparison

Feature	Astilbe	Sweet Pea
Scientific Name	Astilbe × arendsii	Lathyrus odoratus
Family	Saxifragaceae	Fabaceae
Category	flowers	flowers
Sun	⛅ Part Shade	☀️ Full Sun
Water	💧💧 Medium to High	💧💧 Medium
Soil	Rich, Moist	Rich, Well-drained
Height	3'	6'
Spread	2'	1'
Bloom Season	Summer	Spring-Summer
Bloom Color	Red, Pink, White, Purple	Mixed
Growth Rate	Medium	Fast
Native Region	East Asia	Italy, Sicily
Maintenance	Low	Medium

Special Traits

Astilbe

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Sweet Pea

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Care Tips

Astilbe

✓Must have consistently moist soil — wilts quickly if dry.
✓Divide every 3-4 years.
✓Leave dried flower heads for winter texture.
✓Feed in spring with balanced fertilizer.

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 Astilbe if you want a low-maintenance plant, and want deer resistance. It thrives in part shade with medium to high water in zones 4–8.

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 4–8. However, they have different sun needs, so plan your garden layout carefully.

View AstilbeProfile →View Sweet PeaProfile →

Frequently Asked Questions

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

Astilbe grows in USDA zones 4-8, while Sweet Pea grows in zones 2-11. Both plants can grow together in zones 4 through 8.

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

Astilbe needs part shade and medium to high 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, Astilbe or Sweet Pea?

Sweet Pea grows taller at 6' compared to Astilbe at 3'. Sweet Pea spreads 1' while Astilbe spreads 2'.

Are Astilbe and Sweet Pea deer resistant?

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

Which is easier to maintain, Astilbe or Sweet Pea?

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

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Detailed Comparison

Feature	Astilbe	Sweet Pea
Scientific Name	Astilbe × arendsii	Lathyrus odoratus
Family	Saxifragaceae	Fabaceae
Category	flowers	flowers
Sun	⛅ Part Shade	☀️ Full Sun
Water	💧💧 Medium to High	💧💧 Medium
Soil	Rich, Moist	Rich, Well-drained
Height	3'	6'
Spread	2'	1'
Bloom Season	Summer	Spring-Summer
Bloom Color	Red, Pink, White, Purple	Mixed
Growth Rate	Medium	Fast
Native Region	East Asia	Italy, Sicily
Maintenance	Low	Medium

Care Tips

Astilbe

✓Must have consistently moist soil — wilts quickly if dry.
✓Divide every 3-4 years.
✓Leave dried flower heads for winter texture.
✓Feed in spring with balanced fertilizer.

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 Astilbe if you want a low-maintenance plant, and want deer resistance. It thrives in part shade with medium to high water in zones 4–8.

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 4–8. However, they have different sun needs, so plan your garden layout carefully.

Frequently Asked Questions

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

Astilbe grows in USDA zones 4-8, while Sweet Pea grows in zones 2-11. Both plants can grow together in zones 4 through 8.

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

Astilbe needs part shade and medium to high 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, Astilbe or Sweet Pea?

Sweet Pea grows taller at 6' compared to Astilbe at 3'. Sweet Pea spreads 1' while Astilbe spreads 2'.

Are Astilbe and Sweet Pea deer resistant?

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

Which is easier to maintain, Astilbe or Sweet Pea?

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