At Mother's Day, my daughter gave me a large pot of hydrangeas. there were 4 plants in the pot(14") It had 4 different colors. Pink, blue, Lavendar, and white. It was totally gorgeous. I have had it outside all summer, got hailed on twice. The other day I noticed it was making new growth. We were gone for a week and when I got home, the pink one has bloom buds, some are opening now and they are rose. I have never had rebloom on a hydrangea brfore, is this common?