Rose propagation is a really simple process, however the success rate is by no means 100%, so make sure to take lots of cuttings from your favorite roses; you can always move your new plants in spring if the location is not perfect. Also keep in mind that many nursery roses are patented and their asexual reproduction even for personal use is illegal. Those roses usually come with tags asserting the patent. If you are not sure, check your rose name online to see if it is listed as "under patent". Patents usually expire after 20 years, so most of the old world roses are patent free. People swear by different methods of propagating roses from cuttings: the little plastic baggies, the cut-up soda pop bottle, the misting. I tried all methods and only found success with this one, so I'm going to recommend it. You might be wondering why the glass jar will work and the plastic bottle won't? The answer is "I don't know".
Cut a healthy stem, still green but stiff at a 45 degree angle. If the cut is far from the next growth bud, cut the remainder of the stem back about a quarter inch above an outward facing bud. If you don't the rose will do the job for you and kill the useless stem, as you can see in this picture. | The stem you choose should have at least one branch with 5 leaflets, this detail is important. The stem shouldn't be longer than 6 inches. Remove any leaves and some people advise all thorns from the bottom part that will be stuck in the ground. Make sure the stem is healthy and free of any pest or damage. | "Bruise" the end that will be in the ground; this will encourage the plant to produce more hormones for rooting. You can bruise it by cutting it lengthwise or smashing it. |
If you have rooting hormone, I strongly recommend it: you need to give the young plant all the help you can. Dip the stem in rooting hormone. If you don't, it will work without it too. | Stick the stem firmly in the ground, it should not be easy to pull out. If the soil is really dry, water it. There is usually enough rain later in the fall to provide sufficient moisture for it. It is best to plant it during or after a rainy, cloudy day, because these conditions put the least stress on the new plant. | Cover the plant with a glass jar. Push the jar into the ground so that it forms a tight seal at the bottom. The jar must remain undisturbed from fall (this is the best time to take rose cuttings) until the next spring. Don't lift the jar to see how the rose is doing. Remove the jar in spring after all danger of frost is gone. |

Different roses take different times to sprout roots, don't be impatient. You can't tell whether a rose took just by looking at it. Some will stay green for the longest time and not take root, some will wither immediately but turn into beautiful healthy little rose bushes in spring. The only sure sign that the stem has roots is if you see new growth at the root level, but that is unlikely to happen during the cold season. Again I have to emphasize the fact that the jar needs to stay undisturbed.
Here is a rose bush that just turned one:
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