Ceanothus americanus, commonly known as New Jersey tea or redroot, is a small, deciduous perennial shrub in the Rhamnaceae (buckthorn) family. It is native to eastern North America, frequently inhabiting dry, open woodlands, prairies, and rocky barrens. The genus name *Ceanothus* is derived from the Greek keanothos, a name used by Theophrastus for a prickly plant, while the species epithet americanus designates its North American origin. Historically, the plant earned its common name, "New Jersey tea," during the American Revolutionary War. When imported Chinese teas were boycotted, colonists turned to the dried leaves of C. americanus as a caffeine-free, domestic alternative that produces a surprisingly tea-like infusion.

The plant is typically low-growing, reaching 0.5 to 1 meter in height, with a woody, often dark red-stained subterranean root system—hence the alternate name "redroot." Its leaves are alternate, ovate to oblong, and possess distinct three-veined patterns originating from the base. In late spring to early summer, it produces dense, showy, terminal clusters of small, fragrant white flowers that are highly attractive to a wide array of native bees, butterflies, and other pollinators. The plant also forms a symbiotic relationship with nitrogen-fixing bacteria in its roots, allowing it to thrive in nutrient-poor or disturbed soils, which makes it a crucial species for ecological restoration and native landscaping.

Ceanothus americanus is primarily utilized for its leaves, which are dried and processed to make an herbal infusion. Unlike many other wild teas, the dried leaves contain no alkaloids like caffeine, yet they provide a mild, slightly astringent, and pleasant flavor that was once quite popular among early settlers. While the leaves serve as the primary tea base, other parts of the plant, including the roots and flowers, have been historically utilized in traditional ethnobotany. Foraging and use are typically focused on sustainable wild-harvesting practices, as the shrub is a valuable component of native prairie and forest-edge ecosystems.

Nutritionally, New Jersey tea is valued not for its macronutrient density, but for its rich array of secondary metabolites. The plant contains a complex matrix of tannins, flavonoids, and triterpenoid saponins. The red-pigmented roots are particularly rich in ceanothic acid and other related triterpenoids, which have been historically prized in traditional medicine for their astringent, antispasmodic, and anti-inflammatory properties. These compounds are used to support lymphatic function and treat respiratory conditions like bronchial congestion. Modern research into C. americanus focuses on its polyphenolic profile, exploring the antioxidant and immunomodulatory potential of the leaves and roots.