There are eight known species. Catharanthus roseus, the Madagascar periwinkle, rose periwinkle, is a species of flowering plant in the family Apocynaceae. Cultivars offer additional color choices, including red, purple, and white. Grasping the plant at the top of the root ball, use your finger to lightly rake the roots apart. Soiree, a new collection of catharanthus varieties from Suntory Flowers, revitalizes the genus best known for the familiar bedding plant vinca. The best temperature for Periwinkle is around 24 to 38 ° C. It performs well in the hardiness zone 2–11. Types of Roots. There are different types of roots depending upon the type and species of plants. The major types are: 1. Dig the hole up to two times larger than the root ball and deep enough that the plant will be at the same level in the ground as the soil level in the container. Seeds can be sown in March in warm temperatures and planted out in early June. (a) Tap root: On germination of a seed, the radicle elongates into primary root or true root or tap root. The eighth species, C. pusillus, is native to India and Sri Lanka. Plant it in the full sun to partial or dappled shade in moist, well-drained soil. Water the plants until they are well moist. Catharanthus is a genus of flowering plants in the family Apocynaceae.Like the genus Vinca, they are known commonly as periwinkles. Propagated from cuttings, Soiree brings completely new genetics that offer different looks, as well as distinct benefits to the landscape market. The pericycle gives rise to several lateral roots, cork cambium, and some part of the vascular cambium. Caring for Annual Vinca The Annual vinca plants will require a light application of fertiliser in the spring and regular watering. Periwinkle (Catharanthus roseus) is an evergreen perennial in the dogbane family (Apocynaceae spp.) It produces attractive bushy foliage that is covered by an often profuse bloom of phlox-like flowers from summer to frost. Once the plant established, it can tolerate temperatures from 34 to 38 ° C. Watering. Types of Roots: On the basis of their origin, roots are of two types – tap root and adventitious root. This plant thrives in summer heat, and is drought-tolerant once established. Catharanthus seedlings should be allowed to grow for about 15 weeks before you plant them outdoors in mid-spring about 20 to 25 cm (8 to 10 inches) apart. Vinca is one of Georgia's best bedding plants for hot, dry, sunny locations with sandy loam or Piedmont clay as a principle soil type. There is a limited number of xylem and phloem. The name Catharanthus comes from the Greek for "pure flower". Secondary growth occurs in the dicot root. Water your catharanthus roseus plants usually during the growing season, this promotes the roots of the plants. This plant comes in a wide variety of colors and sizes. It grows best in well-drained soil. Catharanthus roseus, commonly called periwinkle, Madagascar periwinkle or annual vinca, is an erect to spreading tender perennial in the dogbane family typically mounding 6-18” (less frequently to 24”) tall and as wide. Once established, it blooms all summer. While it prefers acidic soil, it tolerates a range of soil types, so long as it has good drainage. Seven are endemic to Madagascar, though one, C. roseus, is widely naturalized around the world. Vinca (Catharanthus roseus, Family Apocynaceae) is one of the top-10 best selling bedding plants in the United States. It has attractive, glossy leaves and rose-pink, phlox-like flowers, which bloom from June to frost. Fibrous Roots The pitch is absent. 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