Rehmannia, from Latin Rehmannia, is endemic, which comes from China – it grows on the slopes and mountain trails. You can also meet him in Korea and Japan, where he was dragged.
There are 6 species that are known to be classified differently. Researchers claim that rehmannia comes from a leper family, although in older classifications it is placed in a family of osteoporosis. Contemporary research indicates that they belong to the topside. The plant can reach a height of 60 to 90 cm. In Poland, the species Rehmannia elata is often cultivated. The branched stems are decorated with cardiovascular, dark green leaves with serrated edges. Leafy and slightly hanging flowers attract attention with their intense colour – petals are pink purple or white with characteristic mottled throats. The inflorescences decorate the plant from late spring to midsummer – the flowering is more abundant in less hot summers.
What does cultivation look like? Rehmannia elata can be used in gardens, but outdoor cultivation is only possible in warm, temperate climates. A safer alternative is greenhouse cultivation – after the frost has stopped, the plant can be put outdoors to decorate the plot, balcony or terrace. The best location will be a sunny place, but it will protect the plant from the hot and harsh sun in summer. What kind of substrate should I choose? When growing outdoors, the soil should be permeable and humusable; when growing in containers, a mixture of compost soil and sand will work. The plant should be dug up in autumn, which will protect it from the first frost. It is then worthwhile to remove wilted leaves and bloomed inflorescences. The plant must be protected from aphid attacks and fungal diseases.
Rehmania propagation can be done by sowing seeds under glass (in spring or autumn) or collecting root cuttings (in winter).
The plant works well on rebates and is used as a component of bouquets. Its healing effects have been known for a long time in traditional Chinese medicine. Rehmannia glutinos root cures nose bleeding, relieves fever and sore throat, is also used in rash. According to Chinese beliefs, root juice provides longevity thanks to its nutritional and toxin-purifying properties.