I went to a plant sale yesterday where they suggested we puddle the new plants rather than watering them in their pots before planting. This seems to entail digging the hole at the same depth as the plant pot but twice as wide, filling the hole with water, then after removing the new plant from it's pot, put it into the hole and back fill around the sides, but don't water it. They suggest that you don't water the plant for at least a week or two, to allow the roots to establish.
Does anyone use this method? Normally I follow the instructions on the new plant label, which is watering the plant in it's pot before removing it and planting it in a hole twice as deep and wide as the plant.