Weeds will germinate in regular sand. We use polymeric sand in our patios. My husband and I own a patio business. Sweep it in dry on dry patio. Remove all excess from pavers then mist lightly. Stay off patio for 24 hours. This sand will bond together like concrete and will not blow away or wash out.
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.
Learn how to fill joints between pavers in your paver patio or walkway using Sakrete Paver Set Sand or Sakrete PermaSand. They are mixtures of sand and special additives for keeping pavers in place while blocking weed growth in joints.