I always like to see the bright jolly flowers of Doronicum, or Leopard's Bane, in late Spring - it's the first of the herbaceous perennials to flower. I'm surprised that it's not more popular, as it does flower quite a bit before even the early subjects in the border. One of the problems is that it's about the same colour and size as the dreaded dandelion, which is in flower at the same time, but it's really well worth having, bridging the gap, as it does, between the spring bulbs and summer perennials. It grows pretty well anywhere, mine is under trees, in light shade. It makes a large clump in just a few years, and can be divided after flowering. I think mine's the ordinary sort, but several named varietes are available.