Common names hydrangea or hortensia. There are several anecdotal and scientifically supported medical uses associated with hydrangea root. In 2009, researchers discovered one of the root's active components, halofuginone, fights autoimmune disorders while still allowing the immune system to function normally. This discovery, in a study published in "Science," one autoimmune disorder the treatment is used for is scleroderma, a potentially fatal disease that causes excess collagen production, which can lead to disfigurement, according to Doctor's Guide. Anecdotal reports indicate hydrangea treats the following disorders: malaria, enlarged prostate, kidney stones, blood sugar imbalances and male pattern baldness.