Uvaursi

Uvaursi, also known as bearberry, refers to Arctostaphylos uva-ursi, a small, creeping evergreen shrub in the heath family (Ericaceae). It forms low mats with leathery, oval leaves and produces small, urn-shaped flowers that are typically white to pink in spring. The plant bears red berries that persist into autumn and are sometimes used for culinary or dye purposes.

Distribution and habitat: Uvaursi is native to boreal and subarctic regions of the Northern Hemisphere, including parts of North America and Eurasia. It favors acidic, well-drained soils and is commonly found on rocky slopes, heathlands, damp meadows, and tundra margins. It tolerates cold climates but typically grows best in open, sunny to partially shaded sites.

Ecology: As a ground-cover species, uvaursi contributes to the understory of boreal and montane ecosystems. It provides food for wildlife when berries are ripe and can form associations with mycorrhizal fungi, aiding nutrient uptake in poor soils.

Uses and chemistry: The leaves contain arbutin, a glycoside with historically noted antimicrobial properties. Preparations from the leaves—such as teas, tinctures, or extracts—have been used in traditional medicine to support urinary tract health. Contemporary evidence for clinical efficacy is limited, and prolonged or high-dose use is discouraged due to potential toxicity. The berries are edible when ripe but are very astringent and are not widely eaten in large quantities; they have been used in jams and dyes in some cultures.

Safety and regulation: Uvaursi should not be used in pregnancy or for extended periods without medical supervision. Potential adverse effects include kidney or liver irritation with long-term or high-dose use. Product quality and regulatory status vary by country.