Hydrangea vs Sweet Pea

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

Hydrangea

Hydrangea macrophylla

Hydrangeaceae · flowers

Deer ResistantMedium Maintenance

Sweet Pea

Lathyrus odoratus

Fabaceae · flowers

Deer ResistantMedium Maintenance

Hardiness Zone Range

Hydrangea (Zones 5-9)

Sweet Pea (Zones 2-11)

Overlap: Both grow in zones 5–9

Detailed Comparison

Feature	Hydrangea	Sweet Pea
Scientific Name	Hydrangea macrophylla	Lathyrus odoratus
Family	Hydrangeaceae	Fabaceae
Category	flowers	flowers
Sun	⛅ Part Shade	☀️ Full Sun
Water	💧💧 Medium to High	💧💧 Medium
Soil	Rich, Moist	Rich, Well-drained
Height	6'	6'
Spread	6'	1'
Bloom Season	Summer	Spring-Summer
Bloom Color	Blue, Pink, White	Mixed
Growth Rate	Medium	Fast
Native Region	Japan	Italy, Sicily
Maintenance	Medium	Medium

Special Traits

Hydrangea

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Sweet Pea

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Care Tips

Hydrangea

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

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 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.

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 5–9. However, they have different sun needs, so plan your garden layout carefully.

View HydrangeaProfile →View Sweet PeaProfile →

Frequently Asked Questions

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

Hydrangea grows in USDA zones 5-9, while Sweet Pea grows in zones 2-11. Both plants can grow together in zones 5 through 9.

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

Hydrangea 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, Hydrangea or Sweet Pea?

Both Hydrangea and Sweet Pea reach approximately 6' in height, with spreads of 6' and 1' respectively.

Are Hydrangea and Sweet Pea deer resistant?

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

Which is easier to maintain, Hydrangea or Sweet Pea?

Both Hydrangea and Sweet Pea have medium 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	Hydrangea	Sweet Pea
Scientific Name	Hydrangea macrophylla	Lathyrus odoratus
Family	Hydrangeaceae	Fabaceae
Category	flowers	flowers
Sun	⛅ Part Shade	☀️ Full Sun
Water	💧💧 Medium to High	💧💧 Medium
Soil	Rich, Moist	Rich, Well-drained
Height	6'	6'
Spread	6'	1'
Bloom Season	Summer	Spring-Summer
Bloom Color	Blue, Pink, White	Mixed
Growth Rate	Medium	Fast
Native Region	Japan	Italy, Sicily
Maintenance	Medium	Medium

Care Tips

Hydrangea

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

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 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.

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 5–9. However, they have different sun needs, so plan your garden layout carefully.

Frequently Asked Questions

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

Hydrangea grows in USDA zones 5-9, while Sweet Pea grows in zones 2-11. Both plants can grow together in zones 5 through 9.

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

Hydrangea 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, Hydrangea or Sweet Pea?

Both Hydrangea and Sweet Pea reach approximately 6' in height, with spreads of 6' and 1' respectively.

Are Hydrangea and Sweet Pea deer resistant?

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

Which is easier to maintain, Hydrangea or Sweet Pea?

Both Hydrangea and Sweet Pea have medium maintenance requirements. They need a similar level of care including regular attention to watering, pruning, and soil health.