Keep your downy jasmine plant in a spot that gets six to eight hours of full sun to partial shade. The spot should be large enough to accommodate the full sized plant's spread, which is 5 to 10 feet.
Apply a 10-10-10 granular fertilizer to the planting site for your downy jasmine. Follow the application instructions on the package. The plant will not require extra fertilization after this initial treatment.
Water your downy jasmine frequently enough to keep the soil moist to the touch, especially during hot summer weather. The downy jasmine is mildly drought-tolerant but will thrive better with regular watering.
Lay down a 3-inch layer of mulch around the base of the plant. This will keep the moisture level high and keep down weeds.
Pinch the growing tips whenever the downy jasmine begins to get too large. You can also let it vine out if you want to use it as a ground cover.