Sure...mine were semi-hardwood cuttings that were taken late spring...most likely in June, though I honestly don't remember...about 4" long with all but 2 leaves removed, wounded at the bottom, dipped in rooting powder (Hormodin), stuck about 1 1/2" deep in a mix of turface, sand, and soil conditioner, container (plastic milk jug cut in half with holes punched in the bottom for drainage) tented with a plastic bag to increase humidity and kept in the shade until roots formed. I've never tried hardwood cuttings during the dormant period, but I'd bet zelkova would root just fine, so definitely worth trying.