This grower is sure of this plant identification.
Eranthis hyemalis (Winter aconite). This species is an early flowering perennial bulb, often blooming in mid to late winter, They will bear yellow-orange, cup-shaped flowers to 25mm across they are borne above the lobed leaves.
You should water the dormant plants during the dry summers to keep the tubers from drying out.Watch out it is poisonous and allergenic.
Rock garden, ground cover, naturaliser, walls