I’ll never forget the moment that I first was asked that question, “Don’t you know what causes that!?” It was at the Chelsea Flower Show in London — and it stands out in my mind because it was one of those rare trips without our kids in tow. We had even managed to secure tickets to the Chelsea Flower Show on the opening day.  Believe me, this was not an easy feat.  This was no ordinary flower show.  It was extra fancy. I mean, look at the fancy people walking through these gardens. The Queen of England even showed up with different members of the royal family — so believe…