Is it deer resistant?

Yes

Azure Bluet is deer resistant.

Houstonia caerulea

Deer: Rarely
Height: 6 in (15 cm)
Spread: 6 in (15 cm)
Zones: 3–10
Light: Full sun

Annual
Perennial
Wildflower

Azure Bluet (Houstonia caerulea)

Photo: Jdshide · CC0

Also called Bluets, Common Bluets, Innocence, Quaker Ladies

Annual Houstonia

More details

Light: Full sun, Partial shade, Shade
Water: Low, Medium
Type: Annual, Perennial, Wildflower
Maintenance: Low
Growth: Medium
Bloom: Spring, Summer
Foliage: Deciduous
Features: Flowering, Native
Best uses: Coastal, Lawn, Mass planting, Meadow, Naturalized, Rock garden, Small space, Woodland