The Helleborus x hybridus 'Walhelivor' or Ivory Prince Lenten Rose is one of my favorites. There are few truly green flowers in nature. This one will make you fall in love with planting for contrast. Not to mention, it does well in shade and thrives with little attention. This is a great flowering perennial to pair with Pittosporum eugenioides 'Platinum'.
Plant type: Perennials
Cold Hardiness Zone: 4-9
Heat Tolerance: >60 to 90 days
Mature size: Forms basal clumps to 12 in. tall, spreads wider.
Growth Habit: Clumping
Flower Color: Green
Blooms: Blooms early spring.