Is it deer resistant?

Yes

Cowslip is deer resistant.

Caltha palustris

Deer: Rarely
Height: 2 ft (61 cm)
Spread: 12 in (31 cm)
Zones: 3–8
Light: Full sun

Aquatic
Bog
Perennial
Wildflower

Cowslip (Caltha palustris)

Photo: Martinus KE · CC BY-SA 4.0

Also called Marsh Marigold, Yellow Marsh Marigold

Perennial Caltha

More details

Light: Full sun, Partial shade
Water: High
Type: Aquatic, Bog, Perennial, Wildflower
Maintenance: Low
Bloom: Spring
Features: Flowering, Native, Poisonous
Best uses: Naturalized, Water edge

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