What is the difference in quality of ephedra collected in different seasons?

Due to the different climate, soil and farming conditions in different regions, the growth and development of medicinal plants are also different, so the harvest time is also different. For example, Ephedra grows in Datong, with a high alkaloid content in September and a high alkaloid content in Chifeng in August, and the reasonable harvesting period in the two places is one month. Therefore, the differences of natural conditions in different regions should be considered when determining the reasonable harvest period. In addition, the regeneration of perennial Chinese herbal medicines should also be considered. If Xia Hou Ephedra can't be harvested, the ephedrine content is low at this time, and the plants are easy to die after harvesting, so it is advisable to harvest it between the autumnal equinox and Qingming. Furthermore, in order to increase the yield per unit area, some varieties can consider increasing the number of harvests. For example, Rehmannia glutinosa can be harvested twice a year (two crops are planted in the south), which is higher than once. Increasing the harvest times reasonably has no adverse effects on the plants themselves, and can improve the yield and quality.