Star jasmines (Trachelospermum jasminoides) -- known also as confederate jasmines -- are spring and summer blooming vines that, with support, can be grown along a wall, fence or trellis. They are also sometimes grown as a ground cover and indoors as container plants. Star jasmines are fairly tender plants, hardy in U.S. Department plant hardiness zones 8 and warmer. Care for star jasmines properly during the winter, which differs from the care they should receive the rest of the year.
Avoid pruning star jasmines in the winter like you would many other vines. Star jasmines bloom on old wood, which means any yearly pruning should be conducted soon after the plant is finished blooming in the summer. Pruning at any other time during the year will cut off next year's buds. Only prune to remove dead or damaged wood during the winter.
Mulch around the base of a star jasmine growing in the garden, especially in U.S. Department of Agriculture plant hardiness zone 8, which is the coolest zone for which this plant is rated. Adding 2 to 4 inches in the late fall will help keep the soil warm in the event that the winter is colder than normal.
Water star jasmines sparingly during the winter. However, when rain is scarce for several weeks, provide them with approximately 1 inch of water.
Move indoor growing star jasmines to an area that receives about four hours of direct sunlight. Other times of the year, they should be set in indirect or filtered sunlight. For the winter, ideal daytime temperatures should be between 20 and 22.2 degrees Celsius and ideal nighttime temperatures between 50 and 55 degrees Fahrenheit. Also, let the soil dry out several inches before watering them again and mist the plants every few days to help increase humidity, which star jasmines prefer.
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