Its quite easy although you might be a bit late in the season. I grew a packet a few years ago and 24 came up - most are still growing in my garden. There are different shades of blue and mauve and I have a beautiful dark purply red colour.

If a friend has Aubretias growing well. Ask to Pull out some bits with the bottom off the stem left on. Make a slit in the soil, with a trowel, pop the stems in the slit where you want them to grow in Sept/early Oct and then just wait. Several stems in each slit. I have always extended my plants this way. Or buy some now, plant and do as I have suggested. This year or next.

Thank you Cammomile and Dorjac for you suggestions,I will get on with it rather than just talk about as in previous years.