The ultimate showdown between hydrangeas and Callas took place this week on our Instagram page. If you missed it, here’s a recap: This week we asked you to vote for hydrangea or Callas, and boy, were we in for a surprise—this week’s winner won by a landslide! And, you know what, what with the winning variety’s seemingly magical color-changing properties, we should have seen it coming! Welcome to the world of hydrangeas, the winner of this week’s flower showdown. It’s All in the Name What’s in a name, you—or Shakespeare—may ask. When it comes to this week’s winner, the answer is, well, everything. Let’s break it down. Hydrangea, a name…