This grower is sure of this plant identification.
Setterwort, Stinking hellebore, Stinkwort, Bear's foot, Hellebore
Helleborus foetidus (Setterwort). The flowers and stems of the perennial are bright yellow to grey-green and are arranged in a fan pattern. The foliage is evergreen with pale green bell-shaped flowers which will become outlined in purple as they age. They will self-sow freely or may be divided in early spring. Make sure you divide only large, well-established clumps as this perennial does not like to be disturbed.
Watch out it is poisonous.
Rock garden, under shrubs Spring/Winter interest.