Take a handful of seeds and grow those. Really isn't any point to cuttings with this species of Datura as D. wrightii will generally start to have a few sprouts germinate in less than 24 hours if you simply soak them in water. But, if you wanted to have some fun... graft a few tips into the top of a tomato plant. Grab some parafilm, a sharp razor blade, and your good to go. Slice your scion down both sides to form a "v" or tapered end. And make a horizontal cut through your tomato stock. Then a single cut vertically down the middle 1/2 inch should do the trick. Wrap tightly with parafilm and your good to hook. Remove top leaves from your scion and remember a shorter scion 1inch exposed out of the graft is preferable to an overly large scion as it will not dry out as fast on you. Next, place in a humidity dome... plastic bottle, plastic bag, whatever works for you. 2 weeks later and you can remove humidity, but I'd leave the wrap in place as the grafted plant will grow right through it.