Marsh (Ledum palustre) otherwise known as forest, black or wild rosemary. This herb is not popular enough, however, it is worth to be interested in it because of its properties. This shrub is quite strongly aromatic with dark green, very narrow, thick leaves with folded edges, which is why it is easy to recognize it. The first mention of the herb comes from Denmark from the 12th century. Matthioli, a famous medieval doctor, recommended it against various types of insects – moles and cockroaches. After that the healing properties of herb had been discovered, which was exactly described by Karol Linnaeus – the creator of plant systematics.