I've snipped a top off a vegging plant by accident, no water, I just stuck the stem in the same pot as the momma, it wilted and came right back and took root, over a week and a half time. Under the right conditions of the environment and the plant, I think it roots quite easy a high percentage of the time. Although the use of root tone or an additive or process will increase success chances and limit the amount of recovery time for the plant, which can add weeks to the process. Hope this helps