click on a thumbnail to view an image, or see all the Catharanthus thumbnails at the Plants Gallery Steve Hurst. Plant Type – Perennial; Flower Colour – White, Pink, Apricot, … Seed may remain dormant for several weeks after maturity. Seed may remain dormant for several weeks after maturity. Best grown in a warm position in a humus rich moisture retentive soil. These are plant that do cope with dry conditions, however perform better with a little water.. Summary. Vinca, also known as periwinkle or myrtle, is a shade-loving perennial that produces lavender, blue or white flowers while Catharanthus roseus (Vinca rosea), also known as Madagascar periwinkle, is a sun-loving perennial that produces white, pink or bi-color blooms. The optimum temperature for germination is 20–25°C, and the germination rate is in general over 95%. Catharanthus roseus (Vinca) Medicinal plant benefits and images. Various hybrids are available in a wide range of colours Synonym: Vinca roseus / Vinca rosea Botanical Pronunciation: kath-uh-RANTH-us ROE-zee-us. C. roseus is a fast-growing perennial plant that spreads principally by seed. Periwinkle (Vinca minor) is an excellent evergreen groundcover with dark green foliage. They are also known by the names of Annual vinca or Madagascar periwinkle.. This is a 1m tall perennial herb with oppositely arranged leaves. After the periwinkle was introduced to the southern United States, it has now become an ornamental plant grown in flowerbeds, serving as a great boarder plant. Drought-resistant, compact perennial shrub, with glossy leaves and pink flowers with red centres throughout summer. Catharanthus roseus (C. roseus) is an important medicinal plant distributed in many countries. Catharanthus are bushy perennials that are usually grown as half hardy annuals by gardeners.. Catharanthus roseus Care. Provided by ARS Systematic Botany and Mycology Laboratory . They reach about 30 to 60cm in height and have flat flowers of white or pink. C. roseus ‘Albus’ bears white flowers. Usually grown as an annual. Oblong to ovate leaves are opposite, simple, ½ to 2 inches long, glossy, with a short petiole. Catharanthus roseus has anti-cancer effects and is traditionally used to treat diabetes, It is a popular ornamental plant in East Africa. It has attracted increasing attention due to it being shown to possess a range of phytochemicals with various biological activities such as antioxidant, antibacterial, antifungal, antidiabetic and anticancer properties. Catharanthus roseus, does an excellent job tolerating the hot temperatures of the summer, and is also able to bear the extremes of drought and heavy rainfall. The perennial periwinkle should not be confused with the bedding plant, Madagascar periwinkle (Catharanthus roseus). Description. 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