Is it deer resistant?

Yes

Japanese Barberry is deer resistant.

Berberis thunbergii

Deer: Rarely
Height: 6 ft (1.8 m)
Spread: 7 ft (2.1 m)
Zones: 4–9
Light: Full sun

Perennial
Shrub

Japanese Barberry (Berberis thunbergii)

Photo: Cbaile19 · CC0

Also called Thunberg's Barberry

More details

Light: Full sun, Partial shade
Water: Low, Medium
Type: Perennial, Shrub
Maintenance: High, Low
Growth: Medium
Bloom: Spring
Foliage: Deciduous
Features: Drought tolerant, Flowering

More in Berberis