had lovelyy floers three years ago then none last year and probably the same this year
are you growing the tall varieties or low growing oners?
I think they flower on last years growth.
Once they've flowered you cut out the flowered stems at ground level (wear gloves because the stems have a very sticky residue which ittitates the skin). The new stems that grow will then produce the next crop of flowers, but not necessarily the first year.
Once they are established you end up with this years growth (non flowering) - last year's growth which shiould flower - and the year befores wjhich needs to be cut out.
Does that make sense?