With the bricks set, pour polymeric sand over them and use the brush to sweep it into the spaces between them
This is a great way to include an area for diggers, which are an essential element of children's gardens.
With the hose, wash the edging with a gentle spray, dampening the sand between the bricks without dislodging it. As the sand absorbs water, it will set, acting like grout to lock the bricks in place for years to come.
What Is Polymeric Sand?: Use polymeric sand to fill the joints between pavers.
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polymeric sand in between pavers to keep weeds out - worth the money
awesome old bricks, pea gravel and rocks - this pathway design is both eye-catching and ... Architectural Landscape Design
PolySweep - the choice for all Stonehenge-installed hardscapes polymeric sand for between pavers
Garden Design London and South East, Garden in Camber Sands, East Sussex