The plum flower is Taiwan's national flower. No wonder you also find it on this set of hand painted tea ware:
'Mei hua', prunus or plum flower is a symbol for resilience in the face of adversity. Why? Because it's one of the few flowers that blossom in winter, when conditions are very rough.
It's also a symbol of successful aging. This is the wish of children for their parents and grand parents: that they blossom as they get older and enter their last season of life.
Do I have to ask what kind of tea would fit with this tea set? Old raw puerh comes to mind right away, of course! But any old tea -Oolong, Liu An...- would be right from this symbolic perspective.