Uses fluid retention kidney tonic kidney stones detoxdescription the herb solidago is a traditional kidney tonic it is a small herbaceous plant found in temperate countries often in the natural flora of grassy mountainous areashow it works whilst solidago has diuretic action this is not the prime role of the plant solidago has been shown to have important antiinflammatory antispasmodic and antiseptic action and seems to strengthen kidney function this makes it useful as an agent to count