The ideal place to take a cutting from a rose bush is at a stem, with a withering flower attached to its tip. Cut the flower head from the stem, making the cut just above the first set of healthy leaves. From this point, cut about 6 to 8 inches of the stem from the bush and remove all but the top two five-leaf-leaflets from the cutting. Cut at 45-degree angles, and always use a sanitized sharp knife or gardening shears. If properly tended, the cutting will become a new rose bush.
Dip the base end of the cutting into water and then into rooting powder.
Fill a 6-inch pot with equal amounts coarse sand and vermiculite. Instead of vermiculite, you can use peat moss or perlite.
Plant the base end of the cutting in the soil, about 2 inches deep. Pat the soil down to hold in place. Plant one to six cuttings in one container.
Water the pot with about two cups of water. Allow the water to drain from the pot.
Place a large, clear plastic bag around the pot, to create a greenhouse, and hold the other end under the bottom of the pot. This will keep the soil moist while the roots develop.
Set in a sunny area, yet not in the direct sunlight. After about six or eight weeks, when new leaves develop, remove the plastic bag from the pot.
Replant each cutting in its own 3-inch peat pot. Water thoroughly and cover each with a plastic food bag to create a greenhouse. In about three weeks, the new rosebush will be ready for planting in the garden.