Hello.. I am a new member and I hope we can get some help. We live in Jacksonville FL and we have 2 plum trees that have not produced any fruit. The one is about 7 yrs old and we figured it needed another one to pollinate so we got another one. The 2nd one is about 4yrs old now. Both trees flowered already this year and both are fully leafed now but no signs of any fruit? My only guess is that they are both the same kind of plum tree but they need a different kind to cross pollinate? If anyone can identify what kind of trees these are and let us know if we need a different kind for them to pollinate, we would truly appreciate it. Thank you for looking. Joel