Tree roses aren't actually a separate species of rose but a standard rose such as a floribunda or hybrid tea rose that has been grafted on a tall trunk. Care of tree roses is identical to that of regular roses, except for one important difference. Because of their height, tree roses need extra care during the winter to protect their long, exposed trunks. Prune tree roses carefully in spring to maintain their attractive, rounded shape.
Protect tree roses from the winter cold. Because of their long trunks, they are especially susceptible to damage caused by icy weather. Create a circular container from wire, and fill it with mulch such as chopped leaves, dry grass clippings or small bark chips that will insulate the tree.
Move container-grown tree rose to an unheated shed or garage and water it twice a month, even if the soil is frozen. Wrap a garbage bag around the area where the rose has been grafted onto the tree.
Support tree roses with a sturdy poles or stakes, especially if you live in a windy area. Drive the stakes carefully into the soil so you don't cut into the roots system, and tie the trunk to the stakes with a strip of fabric or a nylon stocking.
Prune tree roses in early spring. Prune the bushy top of the rose by a third to maintain its rounded shape, but never prune the main stalk. Remove any dead branches, any stems smaller than the diameter of a pencil and any branches that are rubbing against other branches.
Water tree roses three or four times a week for about 30 minutes, especially if the weather is hot and windy. Water them at ground level, and don't wet the leaves.
Fertilize tree roses about two weeks after they start to leaf out in spring. Use a fertilizer formulated especially for roses, and follow the manufacturer's directions carefully. Continue to fertilize the tree rose regularly until about six weeks before the first hard frost.