Offered are three-year-old seedlings. This rather rare Clivia with yellow flowers is very different from the real species, which produces red flowers.
A nice detail is that it is self-vertical, i.e. it fertilises itself, resulting in a nice cluster of red coloured fruits between the leaves after a few months. Clivias like a heavy, nutritious soil mixture with the addition of clay.
To promote flowering, they should hibernate in a cool, frost-free moderately light place in winter, after which they can continue to be cared for outside in a shady spot in early May, by watering well and giving them a little fertiliser every now and then.