Blue Mophead Hydrangeas under my Balcony

Hydrangea macrophylla

These will be blue in May!
From Methods of Healing:

The substances from the root of the hydrangea plant are a welcomed alternative to current treatments for immune-related medical conditions. There are many benefits to adopting this recipe in a treatment plan for these types of disorders.

Researchers have found that they can make a medication, halofuginone (derived from the roots of the plant) that serves to keep the body from producing harmful white blood cells that are commonly associated with immune system diseases. It can do this without interfering with health immune system functioning.