Answer: Tradescantia, or spiderwort are beautiful, aren't they? To grow well they like a moist soil so be sure to water regularly, keeping the soil moist but not soggy wet. Cutting back once they have flowered should result in a second bloom later in the season. I would cut the plants back now to encourage new growth and then next spring I would dig and separate the plants. You're right, the roots are vigorous and the job will not be easy but once you've finished, you'll have beautiful plants all over your yard. Enjoy!
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