Black horehound is a perennial native to the Mediterranean region and central Asia but also found throughout Europe and other parts of the world. The whole plant has a very strong and characteristic smell and grows up to 70-100 cm. Despite its small flowers, pollination is performed by bumblebees and bees. Black horehound has been used widely in traditional folk medicine worldwide. The first documented use of the herb dates back to the 13th century and have differed among regions through history; for external wound-healing, stomach-disorders, as a sedative in cases of nervous disorders, for treating sleep disorders and in cough tinctures. Usually, it has been used in the form of leaf-tea. Studies show that black horehound has antidepressant, antibacterial, anti-inflammatory, antifungal and antibacterial effects.
Start cultivation in April in a broadcast tray under light conditions, approximately 20-23 °C. Initially sow the seeds in tray substrate. Cover seeds to a depth of 1 cm. If seeds do not germinate at room temperature, try a cooling period in fridge for a month and put the tray back in room temperature for germination. When large enough to handle, transplant the plants into small individual pots in pot substrate. The pots can be placed in an unheated greenhouse, or outside when the risk of frost is over. When fully rooted in the pots, plant outside in field. Black horehound prefers semi-shade or sunny settings.