Answer: Annual vinca (Catharanthus roseus) is a tropical perennial, and so is grown as an annual in cold regions. The plant likes hot, humid weather and flowers best during these times. The plant has a mounding habit, not a trailing one. (There is a plant called "vinca vine" that is commonly used in planters. It does form vines, and does not flower.)
If you are looking for a plant that will trail down from your hanging basket, you might try ivy geraniums, nasturtium, or petunias, especially the 'Wave' series. Hope this helps!
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