Mystery Flower

I've spent the day tweaking and uploading photos from the week in Scotland. I'm almost at one thousand (!) and still going so today's blip had to be a quick one. Whilst we were away the garden has bolted and this purple flower has come into its own. Sadly I have forgotten what it is called, but I'm sure someone will be able to tell me. The bud always reminds me of an origami box.