The Japanese primrose (Primula japonica, candelabra) is in bloom. Flowers all summer long.
The last garden planted by Henry Francis du Pont (1880-1969, American) at Winterthur, Delaware, was planted in a quarry with a natural spring.
The Japanese primrose populates the quarry bed beneath the shade of bushes which include azalea and the lily-of-the valley bush (Andromeda japonica).
The Quarry Garden, Winterthur, Delaware
Having admired this primrose in the Quarry Garden, the proprietor of Mt. Cuba, Hockessin, Delaware, Pamela Lammot du Pont Copeland (1906-2001, American) seeded a small area around a pond at Mt. Cuba with the same plant.
The Japanese primrose is the only non-native plant supported at Mt. Cuba, a park and garden of flora native to the Appalachian Piedmont.
Japanese primrose, Mt. Cuba, Delaware, from whose website this photo
Mt. Cuba, Hockessin, Delaware