Traditional Chinese medicine uses it against asthma and acute bronchitis attacks. It is a hot spicy product that releases the cold biao wind. Its main property is that it allows to do the sweating.
Verbena officinalis, the common vervain or common verbena, is a perennial herb native to Europe. It grows up to a metre/yard high, with an upright habitus. The lobed leaves are toothed, the delicate spikes hold mauve flowers.
Corylus avellana, the common hazel, is a species of hazel native to Europe and western Asia, from the British Isles south to Iberia, Greece, Turkey and Cyprus, north to central Scandinavia, and east to the central Ural Mountains, the Caucasus, and northwestern Iran.
It grows-up to a height of 4-6 feet depending on the dept of the swamp or creek it is growing in, maximum spread of 9 inches. It can be grown in a pot. Widely cultivated for its large pink flowers.