Wait until the ground is dry. To make sure scrape and probe with your fingers a couple of centimetres below the surface of the ground.
Name
Is derived from John Tradescant (1608-1662), gardener to The court of Charles I of England, arrived in 1637 in Virginia, one of the first territories colonized by the English in America.
Origin
North America and south-central, Mexico.
Family
Commelinaceae
TRADESCANTIA ZEBRINA VIOLET HILL
TRADESCANTIA = GRASS MISERY
The term grass misery it has probably been given to the habit of worshipping and falling down.