Black-Eyed Susan Vine vs Onion

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

Black-Eyed Susan Vine

Thunbergia alata

Acanthaceae · vines

Deer ResistantLow Maintenance

Onion

Allium cepa

Amaryllidaceae · vegetables

EdibleDeer ResistantLow Maintenance

Hardiness Zone Range

Black-Eyed Susan Vine (Zones 10-11)

Onion (Zones 3-9)

No zone overlap — these plants cannot be grown in the same climate

Detailed Comparison

Feature	Black-Eyed Susan Vine	Onion
Scientific Name	Thunbergia alata	Allium cepa
Family	Acanthaceae	Amaryllidaceae
Category	vines	vegetables
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Well-drained	Rich, Well-drained
Height	8'	1' 6"
Spread	2'	4"
Bloom Season	Summer-Fall	Summer
Bloom Color	Orange, Yellow, White	White
Growth Rate	Fast	Medium
Native Region	East Africa	Central Asia
Maintenance	Low	Low

Special Traits

Black-Eyed Susan Vine

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Onion

Yes — EdibleYes — Deer ResistantNo — Drought Tolerant

Care Tips

Black-Eyed Susan Vine

✓Treat as annual in most zones.
✓Provide trellis or let trail from basket.
✓Deadhead for continuous bloom.
✓Start indoors 6 weeks before last frost.

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 Black-Eyed Susan Vine if you want a low-maintenance plant, and want deer resistance. It thrives in full sun with medium water in zones 10–11.

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.

View Black-Eyed Susan VineProfile →View OnionProfile →

Frequently Asked Questions

Can Black-Eyed Susan Vine and Onion grow in the same hardiness zone?

Black-Eyed Susan Vine grows in USDA zones 10-11, while Onion grows in zones 3-9. These plants have no overlapping hardiness zones, so they cannot be grown together in the same climate.

Do Black-Eyed Susan Vine and Onion have the same sun and water needs?

Black-Eyed Susan Vine needs full sun and medium water, while Onion needs full sun and medium water. They share similar growing requirements and can be planted in the same bed.

Which grows taller, Black-Eyed Susan Vine or Onion?

Black-Eyed Susan Vine grows taller at 8' compared to Onion at 1' 6". Black-Eyed Susan Vine spreads 2' while Onion spreads 4".

Are Black-Eyed Susan Vine and Onion deer resistant?

Yes, both Black-Eyed Susan Vine and Onion are considered deer resistant, making them excellent choices for gardens in areas with deer pressure.

Which is easier to maintain, Black-Eyed Susan Vine or Onion?

Both Black-Eyed Susan Vine 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	Black-Eyed Susan Vine	Onion
Scientific Name	Thunbergia alata	Allium cepa
Family	Acanthaceae	Amaryllidaceae
Category	vines	vegetables
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Well-drained	Rich, Well-drained
Height	8'	1' 6"
Spread	2'	4"
Bloom Season	Summer-Fall	Summer
Bloom Color	Orange, Yellow, White	White
Growth Rate	Fast	Medium
Native Region	East Africa	Central Asia
Maintenance	Low	Low

Care Tips

Black-Eyed Susan Vine

✓Treat as annual in most zones.
✓Provide trellis or let trail from basket.
✓Deadhead for continuous bloom.
✓Start indoors 6 weeks before last frost.

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.

Frequently Asked Questions

Can Black-Eyed Susan Vine and Onion grow in the same hardiness zone?

Black-Eyed Susan Vine grows in USDA zones 10-11, while Onion grows in zones 3-9. These plants have no overlapping hardiness zones, so they cannot be grown together in the same climate.

Do Black-Eyed Susan Vine and Onion have the same sun and water needs?

Black-Eyed Susan Vine needs full sun and medium water, while Onion needs full sun and medium water. They share similar growing requirements and can be planted in the same bed.

Which grows taller, Black-Eyed Susan Vine or Onion?

Black-Eyed Susan Vine grows taller at 8' compared to Onion at 1' 6". Black-Eyed Susan Vine spreads 2' while Onion spreads 4".

Are Black-Eyed Susan Vine and Onion deer resistant?

Yes, both Black-Eyed Susan Vine and Onion are considered deer resistant, making them excellent choices for gardens in areas with deer pressure.

Which is easier to maintain, Black-Eyed Susan Vine or Onion?

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