I have this marvelous perennial that was in the garden when we bought the house almost 10 years ago. Darned if I know what it is. If any readers have a clue, please leave a comment. It has these bright yellow, cup-shaped flowers in early June atop leafy stems about 18-24 inches high. It spreads by underground runners.
By now, the plant has migrated to the front of the flower bed, where it is blocking the view of shorter perennials such as a red-leafed coral bell and scented-leafed geraniums. So, I'm wondering if I should just yank out the intruding masses, or whether I should try to transplant them to the back of the flower bed. And is this the right time to do it?