Spread or fan the roots over the mound in the bottom of the hole. Then fill up the rest of the hole with the remaining soil and gently press down. Slowly pour about two or three gallons of water over and around the base of the plant or until it pools on top of the soil. This will keep the water from running away and allow it to soak in around the plant. The most important thing you can give your new rose is water.
Water settles the soil around the root system, and helps the roots transport nutrients to the plant.
Mound up soil over the crown of the plant to about six-inches high so that at least two inches of the canes show. Keep the soil there for about two weeks it will help keep the newly planted rose from drying out. After two weeks, gently pull or wash away the soil mound. Be careful with this process new leaf buds can be easily knocked off. Place mulch around the base of the plant about three inches thick.