I have grown this mystery squash on my allotment. You can just see my fingers at the bottom of the picture for scale. Helen gave me the plant but even she is not sure what type of squash it is. She suggested it was just a big courgette but it is not because it has a hard, waxy skin. I wonder if it will taste nice and when I should harvest it. Yet another Helenandjo Mystery waiting to be solved. Other open cases include The Mystery of the Balloon in the Garden and The Mystery of Which Moron Vandalised Our Trees – see previous posts.