When hexies are sewn together in this manner the quilt will become a parallelogram rather than a rectangle. To correct this I added filler pieces to the top, bottom and sides and then the quilt was appliqued to a brown border to give the quilt a rectangular shape. There is nothing wrong with this sewing hexagon flowers one next to the other - the quilt just has a different look and feel but it takes some planning to make the filler shapes because they will have to be different to accommodate the shape of the quilt . If you are a beginner it may be a little challenging planning to fill in the sides to create a rectangle.
To demonstrate the effect of flower hexies with and without a path I did a quick sketch to demonstrate. The sketches on the left are sewn together without a path and on the right with a path. On the left you can see the slope developing whereas on the right the quilt remains squared. If you sew your hexagons together into diamonds the same issue will arise if a path is not used.
If you chose to add a path there will still be filler pieces created for the top, bottom and sides but the top and bottom fillers will be the same as will the side fillers. And importantly the quilt will have a different look. So before you make the decision whether or not to use a path do give some thought as to how you want your quilt to look and perhaps even sketch it out on hexagon graph paper. The paper above was downloaded from Print Free Graph Paper. You can also find free downloadable design sheets at Paper Pieces.