Mount Cook Buttercup (Ranunculus Lyallii) is a perennial herb in the Ranunculaceae family with moderate care difficulty. It requires high watering and full sun or partial shade light in USDA hardiness zones 7-9. This plant is toxic to cats and dogs — keep it out of reach of pets.

Ranunculus lyallii is the largest species of buttercup, a herbaceous perennial plant native to New Zealand's alpine regions.