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Begin with a soil test to determine ph and nutrient levels so that corrections can be made if needed. A ph of 6.5 is the point where nitrogen, phosphorous, and potassium (npk), plus trace minerals are most easily available to your flowers. Arid regions tend to have alkaline soils and regions with heavy rainfall tend to have acidic soils. Dig a big hole. It is the single most important factor in growing beautiful, large rose bushes. The hole needs to be 2 feet x 2 feet. Plant roots tend to stay inside the holes that they are planted in. By digging a big hole, the roots have room to spread. The more area the roots cover, the better the rose can absorb water and nutrients providing the desired top growth. Prep the soil. Mix 1/3 peat moss with soil from the top 2/3 of the hole. Discard the soil from the bottom of the hole, as it is normally not as fertile as the top. Add 1 cup of bone meal to the mixture, and then place well-rotted cow or horse manure in the bottom 6 inches of the hole. It will provide food for the rose when the roots reach it after the first growing season. Manure and some compost can be hot, so putting it only in the bottom of the hole will prevent burning the fine feeder roots. Fill the hole with enough soil mixture so the soil will sit 1 inch lower than the level of the surrounding area. Squeeze the pot to loosen the plant, place one hand over the surface and turn upside down, catching the rose as it slides from the pot. Set the plant in place. Fill with remaining soil mixture and water well. Using a bagged potting mix with fertilizer added to it could burn or stunt the young root development