Proper mixing of garden soil, plant ash, humus soil, peat soil, Huangshan mud and yellow sand (yellow sand is preferably mountain sand) will be a good way to cultivate soil. For example, Milan has two peat soils and 1 sand, or two fertile garden soils and two compost soils and 1 sand.

Different plants are suitable for different soils. The following are for reference:

Humus soil is formed by natural accumulation and decay of fallen leaves accumulated under a big tree all the year round. It is also called humus soil, which is rich in nutrition, acidic, loose in texture and granular in structure, and is a loosening agent for cohesive soil.

You can use local materials or collect fallen leaves yourself. After all the leaves are rotten, they can be screened for later use and are suitable for sowing and transplanting seedlings. Especially saprophytic soil under deciduous broad-leaved trees is better.

Pine needle soil under coniferous trees such as pine trees has poor available nutrients, but it is very loose, especially suitable for planting rhododendron and bluegrass. Generally, humus soil under deciduous broad-leaved trees is screened and added with 10% retting cake fertilizer powder or mixed with 5% multi-element slow-release compound fertilizer particles, which is an ideal family potted soil and can be used for planting camellia, tea tree, wintersweet, cinnamon, gardenia, Clivia, orchid, Milan, Eupatorium odoratum, Prynne and jasmine.

The cultivated soil should have good aggregate structure and suitable pH value. Good aggregate structure can ensure loose soil, good water retention and permeability. The pH and texture of soil will also affect the growth of trees. Pines, cycads, rhododendrons and gardenias like acidic soil, immortals, elms and boxwood like alkaline soil, and pineapples and maple leaves like neutral soil.