Celery vs Onion

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

Celery

Apium graveolens

Apiaceae · vegetables

EdibleHigh Maintenance

Onion

Allium cepa

Amaryllidaceae · vegetables

EdibleDeer ResistantLow Maintenance

Hardiness Zone Range

Celery (Zones 2-10)

Onion (Zones 3-9)

Overlap: Both grow in zones 3–9

Detailed Comparison

Feature	Celery	Onion
Scientific Name	Apium graveolens	Allium cepa
Family	Apiaceae	Amaryllidaceae
Category	vegetables	vegetables
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧💧 High	💧💧 Medium
Soil	Rich, Moist	Rich, Well-drained
Height	2'	1' 6"
Spread	8"	4"
Bloom Season	Summer-Fall	Summer
Bloom Color	White (small)	White
Growth Rate	Slow	Medium
Native Region	Mediterranean, Europe	Central Asia
Maintenance	High	Low

Special Traits

Celery

Yes — EdibleNo — Deer ResistantNo — Drought Tolerant

Onion

Yes — EdibleYes — Deer ResistantNo — Drought Tolerant

Care Tips

Celery

✓Start seeds 10-12 weeks before last frost — needs light to germinate.
✓Keep soil consistently moist.
✓Blanch stalks by mounding soil or using cardboard for milder flavor.

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 Celery if you don't mind high maintenance. It thrives in full sun with high water in zones 2–10.

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

View CeleryProfile →View OnionProfile →

Frequently Asked Questions

Can Celery and Onion grow in the same hardiness zone?

Celery grows in USDA zones 2-10, while Onion grows in zones 3-9. Both plants can grow together in zones 3 through 9.

Do Celery and Onion have the same sun and water needs?

Celery needs full sun and high water, while Onion needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Celery or Onion?

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

Are Celery and Onion deer resistant?

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

Which is easier to maintain, Celery or Onion?

Celery has high maintenance while Onion has low maintenance. Onion may be easier for beginning gardeners to manage.

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Detailed Comparison

Feature	Celery	Onion
Scientific Name	Apium graveolens	Allium cepa
Family	Apiaceae	Amaryllidaceae
Category	vegetables	vegetables
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧💧 High	💧💧 Medium
Soil	Rich, Moist	Rich, Well-drained
Height	2'	1' 6"
Spread	8"	4"
Bloom Season	Summer-Fall	Summer
Bloom Color	White (small)	White
Growth Rate	Slow	Medium
Native Region	Mediterranean, Europe	Central Asia
Maintenance	High	Low

Care Tips

Celery

✓Start seeds 10-12 weeks before last frost — needs light to germinate.
✓Keep soil consistently moist.
✓Blanch stalks by mounding soil or using cardboard for milder flavor.

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 Celery if you don't mind high maintenance. It thrives in full sun with high water in zones 2–10.

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

Frequently Asked Questions

Can Celery and Onion grow in the same hardiness zone?

Celery grows in USDA zones 2-10, while Onion grows in zones 3-9. Both plants can grow together in zones 3 through 9.

Do Celery and Onion have the same sun and water needs?

Celery needs full sun and high water, while Onion needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Celery or Onion?

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

Are Celery and Onion deer resistant?

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

Which is easier to maintain, Celery or Onion?

Celery has high maintenance while Onion has low maintenance. Onion may be easier for beginning gardeners to manage.