Common garden soil, plus perlite mix well, conditional can add some chicken manure fertilizer. Find a bigger one and mix the soil well.
Insert a few knives along the edge of the basin with a knife to separate the walls of the basin.
Look, this is a soil ball.
Prepare the flowerpot.
Put the soil and flowers in the middle.
Fill the surroundings with soil with small tools.
Use a beaked bottle to slowly pour through, and try not to touch the seedlings when watering. It's fully poured, and the basin is finished!
Take care of it and wait for it to grow up.