Is it deer resistant?

Yes

Britton's Wild Petunia is deer resistant.

Ruellia simplex

Deer: Rarely
Height: 4 ft (1.2 m)
Spread: 3 ft (91 cm)
Zones: 8–11
Light: Full sun

Annual
Perennial

Britton's Wild Petunia (Ruellia simplex)

Photo: İmmortalance · CC0

Also called Mexican Bluebell, Mexican Petunia, Texas Petunia

More details

Light: Full sun, Partial shade
Type: Annual, Perennial
Maintenance: Medium
Growth: Fast
Bloom: Fall, Summer
Features: Drought tolerant, Flowering
Best uses: Border, Container, Houseplant, Patio, Water edge

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