Delphinium vs Hydrangea

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

Delphinium

Delphinium elatum

Ranunculaceae · flowers

Deer ResistantHigh Maintenance

Hydrangea

Hydrangea macrophylla

Hydrangeaceae · flowers

Deer ResistantMedium Maintenance

Hardiness Zone Range

Delphinium (Zones 3-7)

Hydrangea (Zones 5-9)

Overlap: Both grow in zones 5–7

Detailed Comparison

Feature	Delphinium	Hydrangea
Scientific Name	Delphinium elatum	Hydrangea macrophylla
Family	Ranunculaceae	Hydrangeaceae
Category	flowers	flowers
Sun	☀️ Full Sun	⛅ Part Shade
Water	💧💧 Medium	💧💧 Medium to High
Soil	Rich, Well-drained	Rich, Moist
Height	6'	6'
Spread	2'	6'
Bloom Season	Early Summer	Summer
Bloom Color	Blue, Purple, White, Pink	Blue, Pink, White
Growth Rate	Fast	Medium
Native Region	Europe, Asia	Japan
Maintenance	High	Medium

Special Traits

Delphinium

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Hydrangea

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Care Tips

Delphinium

✓Stake tall varieties.
✓Cut back after first bloom for possible rebloom.
✓Needs cool summers — struggles in heat.
✓Slugs love young growth.
✓All parts are toxic.

Hydrangea

✓Prune after flowering on old wood varieties.
✓Add aluminum sulfate for blue flowers, lime for pink.
✓Protect from afternoon sun in hot climates.

Which Plant Is Right for Your Garden?

Choose Delphinium if you don't mind high maintenance, and want deer resistance. It thrives in full sun with medium water in zones 3–7.

Choose Hydrangea if you don't mind medium maintenance, and want deer resistance. It thrives in part shade with medium to high water in zones 5–9.

Plant them together? Both overlap in zones 5–7. However, they have different sun needs, so plan your garden layout carefully.

View DelphiniumProfile →View HydrangeaProfile →

Frequently Asked Questions

Can Delphinium and Hydrangea grow in the same hardiness zone?

Delphinium grows in USDA zones 3-7, while Hydrangea grows in zones 5-9. Both plants can grow together in zones 5 through 7.

Do Delphinium and Hydrangea have the same sun and water needs?

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

Which grows taller, Delphinium or Hydrangea?

Both Delphinium and Hydrangea reach approximately 6' in height, with spreads of 2' and 6' respectively.

Are Delphinium and Hydrangea deer resistant?

Yes, both Delphinium and Hydrangea are considered deer resistant, making them excellent choices for gardens in areas with deer pressure.

Which is easier to maintain, Delphinium or Hydrangea?

Delphinium has high maintenance while Hydrangea has medium maintenance. Delphinium may be easier for beginning gardeners to manage.

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Detailed Comparison

Feature	Delphinium	Hydrangea
Scientific Name	Delphinium elatum	Hydrangea macrophylla
Family	Ranunculaceae	Hydrangeaceae
Category	flowers	flowers
Sun	☀️ Full Sun	⛅ Part Shade
Water	💧💧 Medium	💧💧 Medium to High
Soil	Rich, Well-drained	Rich, Moist
Height	6'	6'
Spread	2'	6'
Bloom Season	Early Summer	Summer
Bloom Color	Blue, Purple, White, Pink	Blue, Pink, White
Growth Rate	Fast	Medium
Native Region	Europe, Asia	Japan
Maintenance	High	Medium

Care Tips

Delphinium

✓Stake tall varieties.
✓Cut back after first bloom for possible rebloom.
✓Needs cool summers — struggles in heat.
✓Slugs love young growth.
✓All parts are toxic.

Hydrangea

✓Prune after flowering on old wood varieties.
✓Add aluminum sulfate for blue flowers, lime for pink.
✓Protect from afternoon sun in hot climates.

Which Plant Is Right for Your Garden?

Choose Delphinium if you don't mind high maintenance, and want deer resistance. It thrives in full sun with medium water in zones 3–7.

Choose Hydrangea if you don't mind medium maintenance, and want deer resistance. It thrives in part shade with medium to high water in zones 5–9.

Plant them together? Both overlap in zones 5–7. However, they have different sun needs, so plan your garden layout carefully.

Frequently Asked Questions

Can Delphinium and Hydrangea grow in the same hardiness zone?

Delphinium grows in USDA zones 3-7, while Hydrangea grows in zones 5-9. Both plants can grow together in zones 5 through 7.

Do Delphinium and Hydrangea have the same sun and water needs?

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

Which grows taller, Delphinium or Hydrangea?

Both Delphinium and Hydrangea reach approximately 6' in height, with spreads of 2' and 6' respectively.

Are Delphinium and Hydrangea deer resistant?

Yes, both Delphinium and Hydrangea are considered deer resistant, making them excellent choices for gardens in areas with deer pressure.

Which is easier to maintain, Delphinium or Hydrangea?

Delphinium has high maintenance while Hydrangea has medium maintenance. Delphinium may be easier for beginning gardeners to manage.