How do I transplant a mature rose ?
The best time to move a rose to make sure it will survive is in the late fall or early spring. Have the new holes ready, water the rose well the day before, then cut the bush down by a half. Dig out as much as you can of the roots near the top, don't be concerned if you can't get the long tap roots, then trim any ragged roots ends off. Place a thick six-inch mulch all around the base as roses love cool roots and also the new feeder roots won't dry out. Because transplanting will have damaged the feeder roots you will now have to water, water, water as they won't be strong enough to supply any nutrients for at least a month. Even if the canes sag and the new leaves droop, just keep watering as the rose bush may not perk up for a couple of months. Don't give it any fertilizer until half way through the summer as you want new roots to grow -- not top growth that the frail roots can't support yet. It may also not make any new growth until next spring. If you have to move it when it is growing, then cut ALL the leaves off the bush to put it into a period of dormancy. Roses are capable of putting out three sets of leaves before it effects their vigor. Then, follow the above instructions.