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.
Brush polymeric paver sand between the cracks of the stones. Do not use regular sand for this step. Polymeric paver sand hardens when wet. This prevents weeds from growing between the stones and keeps the stones in place.