Moldy leaves are the best for plants. Good soil has a crumbled, single-granule structure because this allows water and air to move well within the soil and alternate with each other. Therefore, soil with this structure, such as moldy leaves, is considered ideal soil.
Soil purchased from a flower shop: When growing plants in a flowerpot you must use good soil. In general, moldy leaves can increase the quality of any soil by mixing them in, but for a flowerpot, better-quality soil is required. This is because the amount of soil inside the pot is limited, so the plant's roots cannot reach other soil. On this point, a flowerpot is different from a garden, and so you should choose soil more carefully when growing a plant in a pot.
When planting in a flowerpot, check to see if the soil has sufficient ventilation for air and retains sufficient moisture. Then mix it with moldy leaves or sand or water it.
Stack up 30 ㎝ of soil, put in 5 ㎝ of fertilizer such as poultry waste, rice bran, or bone waste, and then put another layer of soil over it. Repeat this process until the soil is stacked as high as 1 meter and leave it for three to six months, mixing it with a shovel once a month. From this you can obtain the ideal soil without needing to buy it or mix it with moldy leaves. Of course, it is also a good idea to buy prepared soil from a flower shop.
Above all else, a sapling should have strong roots, and thus it should have many rootlets. In addition, its branches should stretch out evenly, and it is recommended that its buds are large, sound, and preferably lustrous. For flower trees, you should check to see whether the flower buds are thick and few, because these are resistant to disease and blossom more. You should especially avoid ones with many scars on the branches. You should always buy a fruit tree with a certified genetic line and check its leaf color prior to buying because a healthy, well-nourished tree has dark green leaves. For graft saplings, you should check to see if the graft is fixed strongly for easy growth in the future.