I am wondering if anyone knows which is better for starting a wild prairie rose clipping, soil or water ?
I'd try soil. Most wild rose species spread vegetatively, so they form a clump of many canes. If the cutting doesn't take you might be able to take one of the small canes from the side of the plant along with a few roots and start a plant that way.
What time of year is the best time to take cuttings to root?