Lungwort (Pulmonaria officinalis)

Bacopa, also known as Water Hyssop or Brahmi, is a creeping succulent perennial that can grow to about 20 inches. It features spatula-shaped fleshy leaves and pale blue or white flowers on slender stalks. Thriving in marshlands and along the edges of mangrove swamps in warmer temperate and tropical climates—especially southern Asia—it develops into dense mats on mudflats. This herb has been a cornerstone of Ayurvedic medicine for supporting cognitive function and treating various nervous system disorders, and it is increasingly recognized in Western herbalism for its brain-enhancing properties.

Coltsfoot is a perennial herb growing to 12 inches with flowering stems covered in purple scales, yellow-gold flowers, and heart-shaped leaves. Indigenous to Europe and northern Asia and naturalized in North America, it is commonly found along roadsides, on verges, and in open areas. The flowers are gathered in late winter, and the leaves in summer. For at least 2,500 years, coltsfoot has been taken as a cough remedy and smoked to ease breathing. The Greek physician Dioscorides in the 1st century CE recommended it for dry coughs and 'for those who are unable to breathe except standing upright.'

Eucalyptus, a traditional Aboriginal remedy, is a powerful antiseptic used all over the world for relieving coughs and colds, sore throats, and other infections. It is warming and stimulating, and for many people its scent conjures up days spent in bed during childhood with eucalyptus and other oils smothered on the chest. Eucalpytus is a common ingredient in many over-the-counter cold remedies.

Irish moss is a reddish-brown seaweed growing to 10 inches, with a flat, forked plant body and fan-shaped outline. Found on the Atlantic coasts of Europe and North America, it grows just below the waterline, attached to rocks and stones. In summer in North America and in autumn in Ireland, it is pulled up by hand or with a rake at low tide and dried in the sun. This seaweed is used extensively in the food and pharmaceutical industries as an emulsifying and binding agent, appearing in products such as toothpastes. Its polysaccharides become jelly-like and demulcent when immersed in water, making it valuable both as a food ingredient and medicinal herb.

Lobelia is an annual herb growing to 20 inches with lance-shaped leaves and pale blue, pink-tinged flowers. A powerful antispasmodic used for respiratory and muscle disorders, it was a traditional Native American remedy for many conditions. It was used as a 'puke weed' to induce vomiting, as a remedy for worms and venereal disease, and as an expectorant. Lobelia was also smoked as a substitute for tobacco and was reputed to share some of its magical qualities. Indigenous to North America, especially eastern parts of the United States, it grows by roadsides and in neglected areas, preferring acid soil. The aerial parts are harvested in early autumn when the seed capsules are most numerous and are carefully dried. Its use was later championed by the American herbalist Samuel Thomson (1769–1843), who made the herb the mainstay of his therapeutic system, mainly using it to induce vomiting.

Osha is a powerful respiratory remedy that has been overharvested in the wild and is extremely difficult to cultivate. It is listed on the United Plant Savers at-risk list. The root has been traditionally valued for its ability to stimulate the digestive and immune systems while expelling mucus. Until wild populations stabilize, its use should be limited, with alternatives like pine, grindelia, and ginger recommended as replacements.

Sweet violet is a creeping perennial growing to 6 inches tall with toothed oval leaves and attractive violet-blue or white flowers with a five-petaled corolla. Native to much of Europe and Asia, it is a common wayside plant also found along roadsides and in woodlands. In classical mythology, sweet violet was associated with death, but classical physicians recognized it as an effective emetic and cough remedy. The 17th-century herbalist Nicholas Culpeper noted that violets are cooling and moistening when fresh and green.

Alfalfa is a perennial herb that can grow to about 32 in (80 cm). It produces trifoliate leaves, flowers ranging from yellow to violet-blue, and spiraling seed pods. It has been called the “king of herbs,” with roots that can extend many feet into the ground to draw up minerals.