What are the growing environment requirements for Rehmannia? Latest interpretation

Rehmannia is a famous medicinal herb, a plant of the genus Rehmannia in the family Scrophulariaceae. It often grows wild on hillsides at low to medium altitudes, and can sometimes be seen along roadsides. In fact, its underground roots are yellow-white, which is why it is called Rehmannia. What exactly is the growing environment of the Rehmannia plant like? All I knew was that it also appears by walls. So this Rehmannia plant must be a plant that is particularly adaptable to its environment.

1. Environment

It is mainly distributed in the north, in Henan, Hebei, Liaoning, and Inner Mongolia; in the northwest, in Shaanxi and Gansu; in the south, in Jiangsu; and in the central region, in Hubei. It may also exist in some other areas, but this is just a broad distribution. It often grows on hillsides, and the more barren the hill, the more it grows. It may grow on roadsides and by walls on flat land.

2. Soil

It mainly prefers to grow in fertile sandy loam soil. This kind of soil is loose and breathable, does not hold water, and is suitable for the expansion of underground tubers. Clay soil is not breathable, loess soil is poor and tends to be acidic. Paddy fields are heavy and sticky, and none of them are suitable for planting Rehmannia. Land at the foot of hills where corn and soybeans are grown is very suitable for planting Rehmannia. However, land that is too dry, has no water source, and turns into muddy water when watered is not suitable soil.

3. Light

It is a sun-loving plant and must receive sufficient light. During the growth period, it cannot be shaded by tall trees or plants. It is not shade-tolerant; it will not grow in large forests, woods, or among shrubs. It generally grows among weeds on sunny hillsides. Or in green grassland. Ordinary light is acceptable, and strong summer light does not affect it.

4. Temperature

It needs to reach a certain temperature before it will germinate. Below 10 degrees, it cannot germinate at all. It needs a temperature above 12 degrees to germinate, and emergence requires a sustained temperature above 12 degrees for about one month. In the south, April to May is the most suitable temperature for germination and growth, around 20 to 28 degrees. The optimal temperature will shorten the time for germination and emergence.

5. Nutrition

Rehmannia likes fertilizer and needs multiple topdressings during the growth period, but topdressing raises the soil concentration, so it must be combined with watering to help absorption. However, Rehmannia has a poor root system and is afraid of both waterlogging and drought, so fertilizer and water can be applied in small amounts multiple times to retain fertilizer and moisture. Do not apply chemical fertilizer; use fermented livestock manure.

The native environment of Rehmannia is sunny hillsides at low to medium altitudes. Based on its characteristics, establish its planting and growing environment. In this way, a suitable environment can be provided in a targeted manner. But if the environment is limited, Rehmannia is actually still quite adaptable.