Can you say Geum?

This is the variety called Martha Bradshaw. Geums have creeping roots that are actually underground stems called rhizomes. New plantlets develop from rhizomes, allowing the plant to spread.  I planted this last year, it did nothing, this year, it is a huge plant.  The flower stems grown high above the mother plant, the flowers remind me of ballerinas.  As the flower buds form and start to open, they are yellow, when they open, they are this color.