Hibiscus (Hibiscus sabdariffa)

White peony is an upright perennial growing to 6.5 feet with large white flowers and divided, dark green leaves. Its history of use in China stretches back at least 1,500 years, and it is one of the herbs in 'Four Things Soup.' The plant is cultivated throughout northeastern China and Inner Mongolia, propagated from seed in spring or from root cuttings in winter. The root of 4- or 5-year-old plants is harvested in spring or autumn.

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. Codonopsis holds a central place in Chinese herbal medicine.

Garlic (Allium sativum) is a bulbous perennial in the onion family, recognized for its sharp flavor and characteristic odor. It is widely used in cooking, and crushed fresh garlic contains allicin. NCCIH says garlic supplements may lower cholesterol, blood pressure and blood sugar to a small extent, but very little research has tested claims that they boost immunity.

Goji berry (Lycium barbarum) is a deciduous shrub that can grow up to about 13 ft (4 m), bearing bright green leaves and vivid scarlet berries. Goji berries have been used in Traditional Chinese Medicine, with references stretching back to the 1st century CE. The berries are rich in vitamins, polysaccharides, and carotenoids.

Hawthorn (Crataegus spp.) is a deciduous, thorny tree reaching up to about 26 ft (8 m), adorned with small lobed leaves, clusters of white blossoms, and bright red berries. Hawthorn has a long history in European medicine as a heart tonic and was traditionally used for heart disease, digestion and blood circulation. NCCIH says there is little or no quality evidence on hawthorn for most conditions, and conflicting evidence in heart failure.

Ju hua (Chrysanthemum x morifolium), commonly called the florists’ chrysanthemum, is a perennial reaching about 5 ft (1.5 m), producing clusters of white or yellow daisy-like flowers.

Linden comprises deciduous trees growing to a height of 100 feet with smooth gray bark, heart-shaped leaves, and clusters of pale yellow flowers with winglike bracts. Native to Europe, it is found in the wild but is also much planted in gardens and along roads. The flowers are collected in summer. Greek myth recounts how the nymph Philyra, devastated after being raped by the god Cronus in the guise of a horse and giving birth to the centaur Chiron, begged the gods not to leave her amongst mortals. The gods granted her wish by transforming her into a linden tree, forever linking this graceful species with transformation and divine mercy.

Motherwort (Leonurus cardiaca) is a perennial herb up to about 5 ft (1.5 m), featuring toothed, palm-shaped leaves and clusters of pink, double-lipped flowers.