Answer: You can propagate Dawn Redwood from stem cuttings, but the best time for taking cuttings is drawing to a close. Ideally, 4" cuttings, taken June-August, of the semi-woody new growth, dipped in a rooting hormone solution and kept in a humid area should root readily. Use a tray filled with moist perlite, and place the tray inside a large, clear plastic bag to maintain the high humidity neccessary for the cuttings to root. Place the tray in a bright location, out of direct light.
If your mother-in-law's weeping cherry is Prunus subhirtella cv.Pendula, it's a naturally pendulous, flowering tree, and you can follow the same rooting procedure mentioned above. Sometimes weeping trees are created by grafting a weeping-type top onto a standard trunk. I think you can still propagate from cuttings, but be sure to use twigs from the weeping top. If you take cuttings from any branches that sprout from below the graft union, you won't get a weeping cherry! Best of luck!
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