Cilantro/Coriander vs Onion

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

Cilantro/Coriander

Coriandrum sativum

Apiaceae · herbs

EdibleLow Maintenance

Onion

Allium cepa

Amaryllidaceae · vegetables

EdibleDeer ResistantLow Maintenance

Hardiness Zone Range

Cilantro/Coriander (Zones 2-11)

Onion (Zones 3-9)

Overlap: Both grow in zones 3–9

Detailed Comparison

Feature	Cilantro/Coriander	Onion
Scientific Name	Coriandrum sativum	Allium cepa
Family	Apiaceae	Amaryllidaceae
Category	herbs	vegetables
Sun	☀️ Full Sun to Part Shade	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Well-drained	Rich, Well-drained
Height	2'	1' 6"
Spread	8"	4"
Bloom Season	Spring-Summer	Summer
Bloom Color	White, Pink	White
Growth Rate	Fast	Medium
Native Region	Mediterranean, Western Asia	Central Asia
Maintenance	Low	Low

Special Traits

Cilantro/Coriander

Yes — EdibleNo — Deer ResistantNo — Drought Tolerant

Onion

Yes — EdibleYes — Deer ResistantNo — Drought Tolerant

Care Tips

Cilantro/Coriander

✓Succession sow every 2-3 weeks — bolts quickly in heat.
✓Prefers cool weather.
✓Let some plants flower for coriander seeds.
✓Self-seeds readily.
✓'Slow-bolt' varieties extend harvest.

Onion

✓Match variety to your latitude — long-day for north, short-day for south.
✓Plant sets or transplants for easiest results.
✓Stop watering when tops fall over.
✓Cure for 2 weeks before storing.

Which Plant Is Right for Your Garden?

Choose Cilantro/Coriander if you want a low-maintenance plant. It thrives in full sun to part shade with medium water in zones 2–11.

Choose Onion if you want a low-maintenance plant, and want deer resistance. It thrives in full sun with medium water in zones 3–9.

Plant them together? Both overlap in zones 3–9. However, they have different sun needs, so plan your garden layout carefully.

View Cilantro/CorianderProfile →View OnionProfile →

Frequently Asked Questions

Can Cilantro/Coriander and Onion grow in the same hardiness zone?

Cilantro/Coriander grows in USDA zones 2-11, while Onion grows in zones 3-9. Both plants can grow together in zones 3 through 9.

Do Cilantro/Coriander and Onion have the same sun and water needs?

Cilantro/Coriander needs full sun to part shade and medium water, while Onion needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Cilantro/Coriander or Onion?

Cilantro/Coriander grows taller at 2' compared to Onion at 1' 6". Cilantro/Coriander spreads 8" while Onion spreads 4".

Are Cilantro/Coriander and Onion deer resistant?

Onion is deer resistant, but Cilantro/Coriander is not. If deer are a concern, Onion is the better choice, or protect Cilantro/Coriander with fencing.

Which is easier to maintain, Cilantro/Coriander or Onion?

Both Cilantro/Coriander and Onion 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	Cilantro/Coriander	Onion
Scientific Name	Coriandrum sativum	Allium cepa
Family	Apiaceae	Amaryllidaceae
Category	herbs	vegetables
Sun	☀️ Full Sun to Part Shade	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Well-drained	Rich, Well-drained
Height	2'	1' 6"
Spread	8"	4"
Bloom Season	Spring-Summer	Summer
Bloom Color	White, Pink	White
Growth Rate	Fast	Medium
Native Region	Mediterranean, Western Asia	Central Asia
Maintenance	Low	Low

Care Tips

Cilantro/Coriander

✓Succession sow every 2-3 weeks — bolts quickly in heat.
✓Prefers cool weather.
✓Let some plants flower for coriander seeds.
✓Self-seeds readily.
✓'Slow-bolt' varieties extend harvest.

Onion

✓Match variety to your latitude — long-day for north, short-day for south.
✓Plant sets or transplants for easiest results.
✓Stop watering when tops fall over.
✓Cure for 2 weeks before storing.

Which Plant Is Right for Your Garden?

Choose Cilantro/Coriander if you want a low-maintenance plant. It thrives in full sun to part shade with medium water in zones 2–11.

Choose Onion if you want a low-maintenance plant, and want deer resistance. It thrives in full sun with medium water in zones 3–9.

Plant them together? Both overlap in zones 3–9. However, they have different sun needs, so plan your garden layout carefully.

Frequently Asked Questions

Can Cilantro/Coriander and Onion grow in the same hardiness zone?

Cilantro/Coriander grows in USDA zones 2-11, while Onion grows in zones 3-9. Both plants can grow together in zones 3 through 9.

Do Cilantro/Coriander and Onion have the same sun and water needs?

Cilantro/Coriander needs full sun to part shade and medium water, while Onion needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Cilantro/Coriander or Onion?

Cilantro/Coriander grows taller at 2' compared to Onion at 1' 6". Cilantro/Coriander spreads 8" while Onion spreads 4".

Are Cilantro/Coriander and Onion deer resistant?

Onion is deer resistant, but Cilantro/Coriander is not. If deer are a concern, Onion is the better choice, or protect Cilantro/Coriander with fencing.

Which is easier to maintain, Cilantro/Coriander or Onion?

Both Cilantro/Coriander and Onion have low maintenance requirements. They need a similar level of care including regular attention to watering, pruning, and soil health.