Is it deer resistant?

Yes

Threespine Barberry is deer resistant.

Berberis triacanthophora

Deer: Rarely
Height: 6 ft (1.8 m)
Spread: 6 ft (1.8 m)
Zones: 5–9
Light: Full sun

Perennial
Shrub

Also called Wisley Barberry

More details

Light: Full sun, Partial shade
Type: Perennial, Shrub
Maintenance: Low
Growth: Medium
Bloom: Spring
Foliage: Evergreen
Features: Flowering
Best uses: Border, Hedge, Mass planting, Meadow, Naturalized, Privacy, Slope

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