Henry Doubleday (1813-1902), a Quaker, brought Russian comfrey to England. He believed that comfrey would help prevent worldwide famine, so his last 30 years were spent in research. He could never ...

Last fall I had carefully harvested and dried comfrey roots to make oil with. It was a careful process and took a while. While in storage in our pantry, a squirrel broke in to steal some nuts and ...

Plant Physiology, Vol. 174, No. 1 (May 2017), pp. 47-55 (16 pages) Pyrrolizidine alkaloids (PAs) are toxic secondary metabolites that are found in several distantly related families of the angiosperms ...