Select strong shoots in late autumn and cut them into 25-30cm (10-12in) lengths, removing any remaining leaves. Dip the base into hormone rooting powder and firm them into a 15-25cm (6-10in) deep trench outdoors, lined on the bottom with sharp sand. The cuttings should have rooted by spring and can be moved the following autumn.
Royal Horticultural Society - Gardening Advice: Rose Propagation

PS. it's easy ... I don't even bother with hormone rooting whatsit

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