Answer: Based on your description I am not certain what is happening with your jasmines. These vines need a soil that is evenly moist yet well drained meaning not sopping wet. Dry soil or unevenly wet and dry soil could cause the buds to abort. Keep in mind also that the individual blooms are not going to last terribly long -- they do naturally fade and then would be replaced by new ones. Lack of buds at all can indicate a nutrient deficiency and/or lack of light. These plants do well in a bright location up to and including full sun, and during the growing season will need regular fertilizing with a slow release fertilizer and/or a water soluble form per the label directions, an analysis such as 10-10-10 or similar proportions plus minors would be a good choice. I hope this helps.
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