A very quick way to propagate this is to collect the red berries in early summer. Squeeze the large, hard seeds out and sow immediately in pots/trays. They germinate well and I have lots of 4 inch high seedlings from last year's seed. Every one of them germinated!

Oooo thank you Volunteer, I will try that, I'm always game for collecting seeds. Did you overwinter them in a greenhouse or outside? There are so many flowers on it this year I should have plenty of berries to have a go.