Is it deer resistant?

Yes

Moss Rose is deer resistant.

Portulaca grandiflora

Deer: Rarely
Height: 8 in (20 cm)
Spread: 12 in (31 cm)
Zones: 2–13
Light: Full sun

Annual
Biennial
Ground cover
Succulent

Moss Rose (Portulaca grandiflora)

Photo: FYFdellitoralUY · CC0

Also called Portulaca, Purslane, Rose Moss, Sun Plant

Annual Portulaca

More details

Light: Full sun
Water: Low, Medium
Type: Annual, Biennial, Ground cover, Succulent
Maintenance: Low
Bloom: Fall, Spring, Summer
Foliage: Deciduous
Features: Drought tolerant, Flowering
Best uses: Border, Container, Hanging basket, Mass planting, Meadow, Naturalized, Path, Patio