Is it deer resistant?

Yes

Bitter Buttons is deer resistant.

Tanacetum vulgare

Deer: Rarely
Height: 5 ft (1.5 m)
Spread: 12 in (31 cm)
Zones: 3–9
Light: Full sun

Herb
Perennial
Weed

Bitter Buttons (Tanacetum vulgare)

Photo: Terry.grignon · CC0

Also called Common Tansy, Cow Bitter, Garden Tansy, Golden Buttons

Perennial Tanacetum

More details

Light: Full sun, Partial shade
Water: Low, Medium
Type: Herb, Perennial, Weed
Maintenance: High, Low
Growth: Fast
Bloom: Fall, Summer
Features: Drought tolerant, Flowering, Poisonous

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