Quizzical Quiz

Would you believe that both of us went out without cameras today. The sweet chickens at Dobbies missed out on their five minutes of fame. This is a reserve Blip.

I wonder if you know what this is. I can't give much of a clue, as I'm sure I'd give it away instantly. All I can say is that I grew it, and I've never seen one for sale at a garden centre.