Dahlia vs Sweet Pea

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

Dahlia

Dahlia pinnata

Asteraceae · flowers

EdibleMedium Maintenance

Sweet Pea

Lathyrus odoratus

Fabaceae · flowers

Deer ResistantMedium Maintenance

Hardiness Zone Range

Dahlia (Zones 8-11)

Sweet Pea (Zones 2-11)

Overlap: Both grow in zones 8–11

Detailed Comparison

Feature	Dahlia	Sweet Pea
Scientific Name	Dahlia pinnata	Lathyrus odoratus
Family	Asteraceae	Fabaceae
Category	flowers	flowers
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Rich, Well-drained	Rich, Well-drained
Height	5'	6'
Spread	2'	1'
Bloom Season	Summer-Fall	Spring-Summer
Bloom Color	Mixed	Mixed
Growth Rate	Fast	Fast
Native Region	Mexico, Central America	Italy, Sicily
Maintenance	Medium	Medium

Special Traits

Dahlia

Yes — EdibleNo — Deer ResistantNo — Drought Tolerant

Sweet Pea

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Care Tips

Dahlia

✓Dig tubers after first frost in cold climates.
✓Pinch growing tips for bushier plants.
✓Provide support for tall varieties.
✓Fertilize regularly.

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 Dahlia if you don't mind medium maintenance. It thrives in full sun with medium water in zones 8–11.

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 8–11. They share similar sun requirements (full sun), making them potential garden companions.

View DahliaProfile →View Sweet PeaProfile →

Frequently Asked Questions

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

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

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

Dahlia needs full sun and medium water, while Sweet Pea needs full sun and medium water. They share similar growing requirements and can be planted in the same bed.

Which grows taller, Dahlia or Sweet Pea?

Sweet Pea grows taller at 6' compared to Dahlia at 5'. Sweet Pea spreads 1' while Dahlia spreads 2'.

Are Dahlia and Sweet Pea deer resistant?

Sweet Pea is deer resistant, but Dahlia is not. If deer are a concern, Sweet Pea is the better choice, or protect Dahlia with fencing.

Which is easier to maintain, Dahlia or Sweet Pea?

Both Dahlia 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	Dahlia	Sweet Pea
Scientific Name	Dahlia pinnata	Lathyrus odoratus
Family	Asteraceae	Fabaceae
Category	flowers	flowers
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Rich, Well-drained	Rich, Well-drained
Height	5'	6'
Spread	2'	1'
Bloom Season	Summer-Fall	Spring-Summer
Bloom Color	Mixed	Mixed
Growth Rate	Fast	Fast
Native Region	Mexico, Central America	Italy, Sicily
Maintenance	Medium	Medium

Care Tips

Dahlia

✓Dig tubers after first frost in cold climates.
✓Pinch growing tips for bushier plants.
✓Provide support for tall varieties.
✓Fertilize regularly.

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 Dahlia if you don't mind medium maintenance. It thrives in full sun with medium water in zones 8–11.

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 8–11. They share similar sun requirements (full sun), making them potential garden companions.

Frequently Asked Questions

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

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

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

Dahlia needs full sun and medium water, while Sweet Pea needs full sun and medium water. They share similar growing requirements and can be planted in the same bed.

Which grows taller, Dahlia or Sweet Pea?

Sweet Pea grows taller at 6' compared to Dahlia at 5'. Sweet Pea spreads 1' while Dahlia spreads 2'.

Are Dahlia and Sweet Pea deer resistant?

Sweet Pea is deer resistant, but Dahlia is not. If deer are a concern, Sweet Pea is the better choice, or protect Dahlia with fencing.

Which is easier to maintain, Dahlia or Sweet Pea?

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