I have had a Wandering Jew (Tradescantia zebrina) plant for several years, but it has never flowered.
It is in a hanging basket outside during the warm season, and indoors during winter.
The temperature gets down to 45°F (7°C) in Miracle Grow potting mix.
It gets lots of water from the rain, but during the dry period I water it.
Q. What should be done to get it to flower?