Agastache is a genus of flowering plants in the mint family, Lamiaceae. It includes several species that are native to North America and East Asia. These plants are often grown as ornamental plants for their attractive spikes of tubular flowers, which come in various colors including blue, purple, pink, and white. The leaves of some species are also fragrant and can be used as a herb.

There is no specific medical definition associated with Agastache as it is not a plant with any known medicinal properties or uses. While some people may use certain species of Agastache for medicinal purposes, there is little scientific evidence to support these uses, and they are not widely recognized by the medical community.