A few years ago, a friend gave us a bulblet of this plant and it has now proliferated and “walked” right around one corner of our garden. The bulblets grow at the top of the flower stem, replacing what would be a flower cluster in a normal onion. As they get heavier they pull over the tall stem right down to the soil and root maybe half a metre away from the original plant; hence the “walking. They are supposed to taste quite good (though on the strong side) but I’ve never tried them. I just find them fascinating.
Farmers are sometimes paid by shooting syndicates to set aside a few strips of their fields to grow a game crop; something that provides shelter and food for game birds through the autumn and winter. Whatever your views on shooting, the practice certainly helps wildlife as well and sun flowers add a wonderful splash of summer colour. Look out for them blooming along field verges through August.