Can polytunnels keep weeds out? What type of wall would be suitable for a lean-to greenhouse? What are the panel's gardening regrets? Kathy and the panel have all the answers. Show more Is a ...

All other chemicals and solvents were of analytical grade and purchased from Aladdin (Shanghai, China). H. flavum rhizome was collected in April 2019 from Guangxi Province, China. The specie was ...