How to grow Persicaria microcephala from cuttings

Common name(s): Knotweed, Fleece Flower
Family: Polygonaceae
Stem cuttings: yes
Leaf cuttings: no
Root cuttings/runners: yes produces runners
Time: spring to fall but best time to cut is before first flowers are shown. In Northern Europe from April to July.
Lighting: bright but no direct sun
Soil: mixes for indoor plants, herbs and vegetables
Temperature: 15 to 30 °C
New growth after: first roots are shown after 2 to 4 weeks
More infos: the images show a cultivar named Persicaria microcephala “Purple Fantasy”