The flowers haven't opened yet but it could well be, Clare!
The tractors are up and down all day, every day, so it's not impossible for a seed to come flying over the wall into the garden but the field directly opposite us has only had maize, wheat and cows in it over the past couple of years, so it's definitely not one of those. Though a cow in the garden would be kind of cool... goes back to the cow being exchanged for the magic beans, ha!
Will let you know my verdict when the flowers open. I'll tell the hens to get laying double portions and you can all come for a fried egg sandwich.