1: Add some rocks to the bottom of the vase. This will help with drainage when you water them. 2: Add soil. I filled mine to about an inch from the top, but it wasn't densely packed so there was still plenty of room for plants. 3: Plant a group of small plants in the soil. Be sure to space out any colorful cacti. 4: Cover the top of the soil with a thin layer of rocks. It's just for looks! So cute... done!
So it didn't work when the whole thing had a layer of soil then a layer of sand (soil rose and mixed with the sand when watered, though may work with a tiny pot with a small cactus in submerged into the bowl full of sand, the only soil being in the pot. Possibly cut the rim off to hide under sand in shallower container.