Black-Eyed Susan Vine vs Delphinium

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

Black-Eyed Susan Vine

Thunbergia alata

Acanthaceae · vines

Deer ResistantLow Maintenance

Delphinium

Delphinium elatum

Ranunculaceae · flowers

Deer ResistantHigh Maintenance

Hardiness Zone Range

Black-Eyed Susan Vine (Zones 10-11)

Delphinium (Zones 3-7)

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

Detailed Comparison

Feature	Black-Eyed Susan Vine	Delphinium
Scientific Name	Thunbergia alata	Delphinium elatum
Family	Acanthaceae	Ranunculaceae
Category	vines	flowers
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Well-drained	Rich, Well-drained
Height	8'	6'
Spread	2'	2'
Bloom Season	Summer-Fall	Early Summer
Bloom Color	Orange, Yellow, White	Blue, Purple, White, Pink
Growth Rate	Fast	Fast
Native Region	East Africa	Europe, Asia
Maintenance	Low	High

Special Traits

Black-Eyed Susan Vine

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Delphinium

No — 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.

Delphinium

✓Stake tall varieties.
✓Cut back after first bloom for possible rebloom.
✓Needs cool summers — struggles in heat.
✓Slugs love young growth.
✓All parts are toxic.

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 Delphinium if you don't mind high maintenance, and want deer resistance. It thrives in full sun with medium water in zones 3–7.

View Black-Eyed Susan VineProfile →View DelphiniumProfile →

Frequently Asked Questions

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

Black-Eyed Susan Vine grows in USDA zones 10-11, while Delphinium grows in zones 3-7. These plants have no overlapping hardiness zones, so they cannot be grown together in the same climate.

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

Black-Eyed Susan Vine needs full sun and medium water, while Delphinium 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 Delphinium?

Black-Eyed Susan Vine grows taller at 8' compared to Delphinium at 6'. Black-Eyed Susan Vine spreads 2' while Delphinium spreads 2'.

Are Black-Eyed Susan Vine and Delphinium deer resistant?

Yes, both Black-Eyed Susan Vine and Delphinium 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 Delphinium?

Black-Eyed Susan Vine has low maintenance while Delphinium has high maintenance. Black-Eyed Susan Vine may be easier for beginning gardeners to manage.

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Detailed Comparison

Feature	Black-Eyed Susan Vine	Delphinium
Scientific Name	Thunbergia alata	Delphinium elatum
Family	Acanthaceae	Ranunculaceae
Category	vines	flowers
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Well-drained	Rich, Well-drained
Height	8'	6'
Spread	2'	2'
Bloom Season	Summer-Fall	Early Summer
Bloom Color	Orange, Yellow, White	Blue, Purple, White, Pink
Growth Rate	Fast	Fast
Native Region	East Africa	Europe, Asia
Maintenance	Low	High

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.

Delphinium

✓Stake tall varieties.
✓Cut back after first bloom for possible rebloom.
✓Needs cool summers — struggles in heat.
✓Slugs love young growth.
✓All parts are toxic.

Frequently Asked Questions

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

Black-Eyed Susan Vine grows in USDA zones 10-11, while Delphinium grows in zones 3-7. These plants have no overlapping hardiness zones, so they cannot be grown together in the same climate.

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

Black-Eyed Susan Vine needs full sun and medium water, while Delphinium 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 Delphinium?

Black-Eyed Susan Vine grows taller at 8' compared to Delphinium at 6'. Black-Eyed Susan Vine spreads 2' while Delphinium spreads 2'.

Are Black-Eyed Susan Vine and Delphinium deer resistant?

Yes, both Black-Eyed Susan Vine and Delphinium 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 Delphinium?

Black-Eyed Susan Vine has low maintenance while Delphinium has high maintenance. Black-Eyed Susan Vine may be easier for beginning gardeners to manage.