Why Do Flowers Fall Off Barleria Repens?

Question

And what is the name of the white part that remains after it falls?

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Answer 1

As flowers fade, they typically fall off or just remain on the stem. The white strand is the style. This article gives some growing tips that should help:

http://blogs.ifas.ufl.edu/nassauco/2017/05/30/fact-sheet-bush-violet/