How to prepare soil for Flower sowing

Wet water-holding soil: 6 parts of ordinary soil, 2 parts of river sand (or pearlite sand), 2 parts of high-quality humus (such as sawdust, peanut shells, leaves and other rotten soil), 1 part of high-quality organic fertilizer, mixed. Dry filtrating soil: 3 parts of ordinary soil, 4 parts of river sand (or pearlite sand) with different thickness, 2 parts of high-quality humus soil and 1 part of organic fertilizer, which can be mixed.