The Clematis Florida Plena, or Alba Plena is the sister plant to the Florida Sieboldii or Sieboldiana or Bicolor. Florida Plena has a huge flowering period June to October inc. at least 5 months of flower every year. The Florida Plena performs best in a sunny spot in the garden which is also sheltered. also known as florida Alba Plena

Sometimes the flowers can revert back to the Sieboldii form, sometimes its just 1 flower, sometimes its a full stem, sometimes its the whole plant! its been around in this country since 1864 (when it came over from Japan) and has always done this.

If you scroll down the picture below, you will even see a flower that has both flower parts (purple and green!)