Nettle (Urtica dioica)

Andrographis, commonly known as Green Chiretta or King of Bitters, is an upright annual herb reaching approximately 3 feet in height. Native to India and cultivated throughout northern regions of India and China, this bitter medicinal plant has been valued in Ayurvedic and traditional Chinese medicine for centuries. Historically used primarily for liver support and treating infections—especially malaria—it has earned recognition for its powerful immune-boosting and protective properties. The plant thrives on plains and in forest undergrowth, where its spotted pale brown or purple flowers and long seed capsules distinguish it from other medicinal herbs.

Black pepper is a perennial woody climbing vine growing to about 16 feet, with large oval leaves, spikes of small white flowers, and clusters of small round fruits that ripen from green to red. Native to southwestern India and now cultivated in tropical areas worldwide, the fruit is harvested from plants that are at least three years old. Different processing methods yield green, black, red, and white peppercorns, each with distinct flavors and uses. Cultivated as both a spice and medicine since ancient times, pepper was such a prized commodity in world trade that Attila the Hun reportedly demanded 3,000 pounds of it as ransom during his siege of Rome in 408 CE.

Boneset (Eupatorium perfoliatum) is a bitter-tasting, upright perennial that can reach about 5 ft (1.5 m). It has lance-shaped leaves and clusters of small white or sometimes purple florets. Renowned in traditional American herbal medicine for colds, fevers, and influenza—especially when body aches are severe—it is believed to stimulate white blood cell activity and encourage sweating, thereby reducing fever and supporting the immune response.

Burdock is a sturdy, bitter herb well-regarded for its detoxifying influence, especially on the skin and liver. It stimulates bile flow, supports liver function, and is frequently used to address acne, eczema, and other skin irritations. Its large leaves may be applied as a poultice to infected sores, and a strong root decoction can soothe itching when added to a bath. Burdock also stabilizes mast cells, potentially reducing allergic reactions.

Catnip is a downy, aromatic perennial growing to 3 feet with heart-shaped, gray-green leaves and whorls of white flowers marked with purple spots. Native to Europe and naturalized in North America, it grows in dry wayside places and mountainous regions up to altitudes of 5,000 feet. The plant is gathered when in flower during summer and autumn. Its name comes from the Norse word 'dylla,' meaning 'to soothe,' reflecting its calming properties. Catnip has an excitatory effect on cats but a sedative effect on humans.

Codonopsis is a small twining perennial growing to 5 feet with oval leaves and pendulous green and purple bell-shaped flowers marked with purple in summer. Native to northeastern China and growing throughout the region—especially in the Shanxi and Szechuan provinces—it is propagated from seed in spring or autumn, and the root is harvested in autumn once the aerial parts have died down. In Chinese herbal medicine, codonopsis holds a central place as a gentle tonic that increases energy levels, improves physical and mental well-being, and helps the body adapt to stress.

Couch grass is a vigorous perennial growing to 32 inches with a long, creeping rhizome, slender leaves, and erect spikes bearing green flowers aligned in two rows. Found in Europe, the Americas, northern Asia, and Australia, it is an invasive weed harvested throughout the year. In classical times, both Dioscorides (40–90 CE) and Pliny (23–79 CE) recommended couch grass root for poor urine flow and kidney stones. The herbalist John Gerard wrote in 1597 that 'Couch-grasse be an unwelcome guest to fields and gardens, yet his physicke virtues do recompense those hurts; for it openeth the stoppings of the liver and reins [ureters] without heat.' In times of famine, the root was roasted and ground as a substitute for coffee and flour.

Elder (Sambucus nigra in Europe) is a deciduous tree that can reach 33 ft (10 m), bearing cream-colored clusters of flowers and dark blue-black berries. Rich in folklore, elder was historically believed to house a protective spirit (“Elder Mother”). Medicinally, both its flowers and berries have notable antiviral properties and can promote sweating to reduce fevers. The flowers also help relieve nasal congestion, while the berries act as a mild laxative and further support the immune system.