Helleborus Niger Helleborus Niger better known to some as Christmas Rose is one of the few herbaceous perennials that will flower through the mid to late winter.
hey will keep their leaves throughout the winter but you can always thin some leaves to show the buds and flowers.
They need a good open well drain soil with plenty of organic matter Incorporated into it when planting and a regular mulch annually , should encourage plenty of flower and buds through the winter.