Tree roses are beautiful, but not as hardy as other roses as they have two grafts or union sites. One is at ground level where hardy roots were grafted onto the tall stem. Be sure to prune any shoots that sprout from the ground near the stem as these will be from the grafted roots and will not bloom well. Also remove any shoots that sprout from the tall trunk of the rose tree. The next graft is at the top of the trunk. Your goal is to remove any shoots or branches from here that are dead or damaged or thinner than a pencil. So you are thinning out weak branches. Then shorten up all the other branches so that they are only about 8 inches long. Yes, this means you will be cutting off lots of branches coming from higher up on the stems but that is okay. You should be left with four main branches aiming outward each with just a few side shoots. Fertilize when you see daffodils in bloom or new growth coming from the branches. You should have fresh new growth and lots of roses by June. Keep growing, Marianne Binetti