Kale vs Onion

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

Kale

Brassica oleracea var. sabellica

Brassicaceae · vegetables

EdibleDeer ResistantLow Maintenance

Onion

Allium cepa

Amaryllidaceae · vegetables

EdibleDeer ResistantLow Maintenance

Hardiness Zone Range

Kale (Zones 2-11)

Onion (Zones 3-9)

Overlap: Both grow in zones 3–9

Detailed Comparison

Feature	Kale	Onion
Scientific Name	Brassica oleracea var. sabellica	Allium cepa
Family	Brassicaceae	Amaryllidaceae
Category	vegetables	vegetables
Sun	☀️ Full Sun to Part Shade	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Rich, Well-drained	Rich, Well-drained
Height	2'	1' 6"
Spread	1' 6"	4"
Bloom Season	Spring, Fall, Winter	Summer
Bloom Color	Yellow (second year)	White
Growth Rate	Fast	Medium
Native Region	Mediterranean	Central Asia
Maintenance	Low	Low

Special Traits

Kale

Yes — EdibleYes — Deer ResistantNo — Drought Tolerant

Onion

Yes — EdibleYes — Deer ResistantNo — Drought Tolerant

Care Tips

Kale

✓Direct sow or transplant.
✓Harvest outer leaves for continuous production.
✓Frost improves flavor.
✓Resistant to many pests.
✓Can overwinter in zones 6+ with protection.

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 Kale if you want a low-maintenance plant, and want deer resistance. 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 KaleProfile →View OnionProfile →

Frequently Asked Questions

Can Kale and Onion grow in the same hardiness zone?

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

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

Kale 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, Kale or Onion?

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

Are Kale and Onion deer resistant?

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

Which is easier to maintain, Kale or Onion?

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

Explore More Data Tools

For adjacent public-data tools, methodology notes, and network updates, visit DataPeek Facts.

Detailed Comparison

Feature	Kale	Onion
Scientific Name	Brassica oleracea var. sabellica	Allium cepa
Family	Brassicaceae	Amaryllidaceae
Category	vegetables	vegetables
Sun	☀️ Full Sun to Part Shade	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Rich, Well-drained	Rich, Well-drained
Height	2'	1' 6"
Spread	1' 6"	4"
Bloom Season	Spring, Fall, Winter	Summer
Bloom Color	Yellow (second year)	White
Growth Rate	Fast	Medium
Native Region	Mediterranean	Central Asia
Maintenance	Low	Low

Care Tips

Kale

✓Direct sow or transplant.
✓Harvest outer leaves for continuous production.
✓Frost improves flavor.
✓Resistant to many pests.
✓Can overwinter in zones 6+ with protection.

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 Kale if you want a low-maintenance plant, and want deer resistance. 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 Kale and Onion grow in the same hardiness zone?

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

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

Kale 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, Kale or Onion?

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

Are Kale and Onion deer resistant?

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

Which is easier to maintain, Kale or Onion?

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