This grower is fairly sure of this plant identification.
Tree peony, Peony
Paeonia lutea (Tree peony). This shrub grows to a height and width of 1.5m. From late spring to early summer it bears single, clear yellow flowers. The leaves are dark green with saw-toothed margins.
They will grow well in climates with a cold winter. They need a sheltered position in full or slightly filtered sunlight and moist soil. You will need to propagate from seed, or by division.
Grown for their bold foliage, showy blooms and in some species colourful seed pods. Flower arranging.
As Alice Morse Earle the American author and historian (1851-1911) memorably wrote: "The Peony always looks like a well-dressed, well-shod, well-gloved girl of birth, breeding, and of equal good taste and good health; a girl who can swim and hike and play golf ..."
Italics = data drawn from parent genus or speciesView Full Plant Finder Record