'Hello Mr Blue'

This lovely Blue Hydrangea is flowering again and this time is coming out as true blue. P bought me this plant from the supermarket in early June, I potted it up with ericaceous compost! The huge 'forced flowers' all quickly died..and are now the dried pinky lilac flowers in the background of this picture. All my other Blue Hydrangeas which I planted in the garden have turned Pink...due to the wrong soil conditions...so this Blue one is staying in a pot!