Plums are always slow to fruit, it can be a few years, if its in a pot be sure its big enough and be aware its what happens this summer that determines next years fruit as for any trees.
you could try a high potash feed once now,then in may and june. Not after that as it needs to harden its growth for the winter
I had plums, not many , last year from my 4 year old victoria.....

thanks pamg. i'll try the potash,and try to be more patient as well.dab

Fingers crossed for you.....a sharp frost when the blossoms out can be disaster, my old tree is covered in flowers, just depends on the weather now....