Yes it is sure to be a grafted rose. It will grow on its own root just fine. I doubt if the patent has run out and you should be aware it is illegal to propagate from cuttings, but that is your choice. You can start from cuttings any time of the year the method will vary a little. Considering where we are in the growing season, I would wait until the new wood starts to harden. Best results are obtained with wood about pencil size to a little larger about six inches long. The mix should be very loose, I like 80% perlite to 20% peat. Use a hormone Rootone is OK. Bottom heat will help but is not required. Leave very little or no foliage, tent with clear plastic to retain humidity. Vent by removing the tent every other day or so to prevent mold and let in oxygen. I usually just turn the tent inside out to remove excess moisture. I allow between 60 and 90 days for root growth. If the stem turns black it is dead. Roses are one of the easiest plants to start from cuttings, but do not expect to have no losses. Al