Thalictrum flavum 'Illuminator' - Clouds of innumerable soft yellow flowers arise from mounds of powdery blue-gray Columbine-like leaves in May to July. Newly emerging leaves are blue with a golden infusion, the cast approximates bright chartreuse, The matte-finished foliage matures blue-gray. The Blue Meadow Rue will be content in full to part sun in fertile, draining soil. Lovely in a mixed border or naturalized. Established potted Blue Meadow Rue from seed or division.