Rose multipliers do grafting for several reasons. The choice of rootstock is decisive for the vigor of the final plant:rosebush for flowering pot, roses in the open ground, climbing roses... The rootstock also depends on the type of soil.
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If the gardener multiplies his roses by cuttings, he should know that some varieties give nothing, others sucker a lot and in general, the plants are less vigorous and therefore more sensitive to parasites and climatic hazards. But it's free. However, some varieties multiply very well like this. It's up to you to try with the roses in your garden (or that of your neighbour).
Arpeggio