Q.Purchased A Fruitless Plum Tree 2 1/2 Years Ago.haven’t Noted Any Growth Except For Some ‘suckers’ On The Side Of Its Trunk.any
remedy ,other than a tree doctor,wold be helpful. The tree had a 2″ diameter trunk when purchased.several branches were on it and each had many leaves. Leaves are still on it,still suple. A cold spell recently occurred in the state, New Mexico, so the watering of this tree will resume as the spring weather returns. it has never produced any flowers.

Certified GKH Gardening Expert
If it isn't growing, but is producing suckers, the tree is stressed. You do need to remove any suckers that show up, particularly if below the graft if there is one.
Plums do prefer moist soil, so it does need supplemental water when rain is not sufficient. It also needs water during the winter. To make sure it is still alive, scrape away some of the bark, if it is green beneath, it is still alive.
If you think you are giving it the proper water, fertilizer, soil and sunny placement, I would suggest testing the soil. Then you will know exactly what fertility is lacking. You can do that at your local extension office. I will give you a link to find their location.