It turned out that the cultivar imported from a botanical garden in Europe was not 'Purple Plush'. It is not known what the name of this cultivar is, so in the near future I will add it as a separate cultivar and change its name to Gibasis geniculata 'NoID'.
Below is a comparision: Gibasis geniculata 'Purple Plush' (left) and Gibasis geniculata 'NoID' (right).
