I have seen partial units or not complete flowers in the edge areas. Some fill with more green hexes , to represent the grass walkway. Some use more white rather than green . Some Grandmothers flower garden quilts I have seen do not have a binding.. both the back and top are turned in 1/4 inch and edge stitched. I think they call that a "knife edge turned edge"... The final edge has the shape of each edge of the hex on the border minus the 1/4 inch.
By the way awesome work fussy cutting alot of those hexes.