A long time ago I was given a ground cover rose. Miss Unknown blooms for all its worth and is beautiful! But buy more? No result, so without a variety name. Hm, the woman herself is: I just take a few cuttings.
Summer, June through August, is a good time to multiply roses. Because the annual shoots are no longer soft, but are already well lignified. If you cut cuttings now, they root quite reliably and do not rot as quickly. This works well with ground cover roses, climbing roses, wild and dwarf roses, less so with noble and bed roses.

Use annual shoot tips
So I cut off the annual shoot tips as long as a finger. I cut off any flowers above a strong leaf. At the bottom of the cutting, I cut the stem just below a leaf knot and remove the leaves, except for the top. So that the leaves evaporate less water, I shorten them by half.
Delicate roots
I fill some nursery pots with seed compost. This is mild and low in salt, so that fine roots can form undamaged. Then I moisten the earth well. I put the cuttings in there one by one. It is best to dip the base in rooting powder beforehand (e.g. in Neudofix Root Activator). This contains plant hormones that stimulate root formation.
I can recommend a good root activator here. So you help your plants enormously and you can be sure that strong roots will come in a short time.
Create a humid microclimate
Finally, I moisten the cuttings and soil vigorously with a water sprayer and close my little rose nursery with a transparent lid. In a place protected from the sun and ideally placed under a roof, there is a humid microclimate underneath. I ventilate daily and water when necessary. After about 2 months, the cuttings are rooted and can move to the bed. A cover made of fir branches brings the small plants safely through their first winter.