Answer: Star jasmine are not susceptible to any particular diseases so I'd look at the soil drainage (or lack of) for clues. Your plants need to be watered regularly but if the soil remains soggy for lengths of time, the roots can rot and the tops of the plants will die. Try watering as usual and then waiting 3-4 days. Dig a hole near the roots of your plant; if the soil is moist 3" beneath the surface, it drains well enough; if it's dry, you didn't apply enough water; if it's soggy wet, the site doesn't drain fast enough.
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