Astilbe vs Butterfly Bush

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

Astilbe

Astilbe × arendsii

Saxifragaceae · flowers

Deer ResistantLow Maintenance

Butterfly Bush

Buddleja davidii

Scrophulariaceae · shrubs

Deer ResistantDrought TolerantLow Maintenance

Hardiness Zone Range

Astilbe (Zones 4-8)

Butterfly Bush (Zones 5-9)

Overlap: Both grow in zones 5–8

Detailed Comparison

Feature	Astilbe	Butterfly Bush
Scientific Name	Astilbe × arendsii	Buddleja davidii
Family	Saxifragaceae	Scrophulariaceae
Category	flowers	shrubs
Sun	⛅ Part Shade	☀️ Full Sun
Water	💧💧 Medium to High	💧💧 Medium
Soil	Rich, Moist	Well-drained
Height	3'	10'
Spread	2'	8'
Bloom Season	Summer	Summer-Fall
Bloom Color	Red, Pink, White, Purple	Purple, Pink, White
Growth Rate	Medium	Fast
Native Region	East Asia	China
Maintenance	Low	Low

Special Traits

Astilbe

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Butterfly Bush

No — EdibleYes — Deer ResistantYes — 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.

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 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 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 5–8. However, they have different sun needs, so plan your garden layout carefully.

View AstilbeProfile →View Butterfly BushProfile →

Frequently Asked Questions

Can Astilbe and Butterfly Bush grow in the same hardiness zone?

Astilbe grows in USDA zones 4-8, while Butterfly Bush grows in zones 5-9. Both plants can grow together in zones 5 through 8.

Do Astilbe and Butterfly Bush have the same sun and water needs?

Astilbe needs part shade and medium to high water, while Butterfly Bush needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Astilbe or Butterfly Bush?

Butterfly Bush grows taller at 10' compared to Astilbe at 3'. Butterfly Bush spreads 8' while Astilbe spreads 2'.

Are Astilbe and Butterfly Bush deer resistant?

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

Which is easier to maintain, Astilbe or Butterfly Bush?

Both Astilbe 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	Astilbe	Butterfly Bush
Scientific Name	Astilbe × arendsii	Buddleja davidii
Family	Saxifragaceae	Scrophulariaceae
Category	flowers	shrubs
Sun	⛅ Part Shade	☀️ Full Sun
Water	💧💧 Medium to High	💧💧 Medium
Soil	Rich, Moist	Well-drained
Height	3'	10'
Spread	2'	8'
Bloom Season	Summer	Summer-Fall
Bloom Color	Red, Pink, White, Purple	Purple, Pink, White
Growth Rate	Medium	Fast
Native Region	East Asia	China
Maintenance	Low	Low

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.

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 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 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 5–8. However, they have different sun needs, so plan your garden layout carefully.

Frequently Asked Questions

Can Astilbe and Butterfly Bush grow in the same hardiness zone?

Astilbe grows in USDA zones 4-8, while Butterfly Bush grows in zones 5-9. Both plants can grow together in zones 5 through 8.

Do Astilbe and Butterfly Bush have the same sun and water needs?

Astilbe needs part shade and medium to high water, while Butterfly Bush needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Astilbe or Butterfly Bush?

Butterfly Bush grows taller at 10' compared to Astilbe at 3'. Butterfly Bush spreads 8' while Astilbe spreads 2'.

Are Astilbe and Butterfly Bush deer resistant?

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

Which is easier to maintain, Astilbe or Butterfly Bush?

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