Keep the soil moist, but not soggy. Overly wet soil causes the plant to turn yellow, then brown and finally die if wet conditions persist.
Protect your Confederate jasmine from intense sun and heat. While it prefers full sun, it scalds if exposed to extreme conditions. This is a very common cause of brown, dry leaves on the vine.
Check to see if the brown leaves are older leaves near the stem’s bottom. It is normal for aging leaves to die, first turning yellow, then brown. Clip aging leaves from the plant.
Grow star jasmine in a container in areas with cold winters and bring it inside before the coldest weather arrives. Frost burn causes leaves to turn brown and fall from the plant, and the entire plant dies if exposed to freezing temperatures for long.