To give your garden a finished look, think about edging your borders. There are several different options available, and the one you choose will depend on the style of your garden and the shape of your flowerbeds. Lay bricks flush to the path… A neat way to create an edge for your flowerbeds is with bricks. For a streamlined look, lay them flush with the ground. This is particularly effective when the border is next to a lawn, as the mower blades can easily move over it.
The bricks here separate the borders from the path and allow the flowers to overlap without blocking the walkway. Read more at link below. https://www.houzz.co.uk/ideabooks/109288748/list/9-simple-ideas-for-edging-your-garden-borders