Is it deer resistant?

Yes

Eve's Needle is deer resistant.

Austrocylindropuntia subulata

Deer: Rarely
Height: 13 ft (4 m)
Spread: 5 ft (1.5 m)
Zones: 9–12
Light: Full sun

Houseplant
Perennial
Shrub
Succulent
Tree

Eve's Needle (Austrocylindropuntia subulata)

Photo: Daderot · CC0

Also called Eve's Needle Cactus, Eve's Pin, Eve's Pin Cactus, Eve's-Pin Prickleypear

HouseplantAustrocylindropuntia

More details

Light: Full sun, Partial shade
Water: Low
Type: Houseplant, Perennial, Shrub, Succulent
Maintenance: Low
Growth: Fast
Bloom: Spring, Summer
Foliage: Evergreen
Features: Drought tolerant, Flowering
Best uses: Accent, Container, Houseplant, Specimen