Rosemary is also known by other names as ayahuasca, and it is a rosemary and shrubby plant. It can grow to about two meters. Its stalks are brown, its leaves are succulent and long, and its leaves are not downy, but its stalks are downy. Its flowering period is around November, the flower edge is purple, inside is white, there are four petals, long like a butterfly. Rosemary is mainly distributed in China's Sichuan, Guizhou, Guangdong, Shaanxi, Shanxi, Yunnan, Jiangsu, Zhejiang and other regions are planted. It mainly grows in ravines, on slopes, by streams and other places. Rosemary likes sunny land fertile and moist, cool climate, drainage and ventilation is very good, but also has a good resistance to cold and drought, but also can be a short time in the stagnant ground growth. Rosemary is often planted in parks, courtyards, gardens, driving roadside, near the rockery and other places, can play an ornamental, greening the city and embellish the role of the scenery.