Rehmannia glutinosa will take several years to harvest.

According to the plant website, Rehmannia glutinosa was planted in April in spring and harvested in autumn 1 1 month in the same year. Its growth cycle is half a year, and it takes 150- 160 days. Most plants are planted with rhizomes, and the whole growth and development process is divided into four periods: seedling growth period, bolting and flowering period, root elongation and expansion period, withering and harvesting period.

Rehmannia glutinosa can be divided into fresh rehmannia glutinosa and dried rehmannia glutinosa; According to the records of herbal medicines and medical books in past dynasties, the efficacy of fresh rehmannia glutinosa in stopping bleeding, clearing away heat and promoting fluid production is better than that of dry rehmannia glutinosa; According to Compendium of Materia Medica, fresh Rehmannia glutinosa has the effects of clearing heat and promoting fluid production, cooling blood and stopping bleeding, while dried Rehmannia glutinosa has the effects of clearing heat and cooling blood, nourishing yin and promoting fluid production. Can be used as natural flower arrangement.