Geranium ibericum 'Ushguli Grijs'

I bought this while visiting nurseries abroad and have found it to be a reliable and lovely plant. The soft-to-the-touch, round leaves are greyish. These form an attractive mound and is covered with clusters of large, lilac-blue flowers that are prettily marked with short veins of purple. Flowers for a relatively short time. I have discovered other plants that look like this popping up in other borders, therefore I suspect it seeds itself t...