Dragonwing begonia help

Dragonwing begonia help

Hi there, I have two big dragonwing begonias on my porch. One of them has 3 main stems, but two of the stems have fallen over, and look like they're broken almost completely off. However, the leaves and flowers on those stems still look great - one of the stems fell over a week ago and it still looks fine. Are the stems actually broken off, and just taking a long time to die? Or should I tie them up somehow so they don't fall completely off? Or should I just leave them be and let nature take its course? What do you think? Thanks!
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Plant id

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