California poppy is a plant. It is the state flower of California. People use the parts that grow above the ground for medicine.
In combination with other herbs, California poppy is used for depression, long-term mental and physical tiredness (neurasthenia), nerve pain, various psychiatric conditions, blood vessel problems, sensitivity to weather changes, and sedation. An herb combination including California poppy is also used for sleep and mood disturbance associated with strong, warm wind in the Alps (foehn illness).