U Hrvatskoj je selekcijom plus stabala u jednoj matičnoj populaciji pokrenuto oplemenjivanje obične smreke kao božićnoga drvca. Idući je cilj toga procesa utrđivanje optimalne procedure kloniranja izabranih plus stabala radi masovne proizvodnje reprodukcijskoga materijala (sadnica). Pretpostavka je da će se takvim načinom stvoriti kvalitetan reprodukcijski materijal koji će se odlikovati stabilnošću ciljnih fenotipskih svojstava. U radu su predstavljeni prvi rezultati istraživanja mogućnosti kloniranja plus stabala obične smreke metodom zakorjenjivanja odrvenjelih reznica. Glavni cilj istraživanja bio je utvrđivanje uspješnosti primjene raznovrsnih hormonskih tretmana na zakorjenjivanje odrvenjelih reznica starijih (10–12 godina) stabala obične smreke uzetih u ranoproljetnom i kasnojesenskom razdoblju s različitih visinskih etaža krošanja (gornja, srednja i donja trećina krošnje). Provedena su dva eksperimenta. U prvom je po 270 reznica odrezano u rano proljeće iz svake od triju visinskih etaža krošanja, na uzorku od 10 stabala. Po 10 reznica iz svake etaže tretirano je s 27 različitih tretmana (2 tipa hormona × 4 koncentracije otopine × 3 vremena trajanja tretiranja + Clonex + kontrola 1 + kontrola 2). Drugo je istraživanje provedeno na po 80 reznica odrezanih iz donje trećine krošanja od 13 izabranih plus stabala u kasnu jesen. Po 30 reznica tretirano je u trajanju od 10 sekundi sa: (i) hormonom IBA koncentracije 2500 ppm, (ii) hormonom IBA koncentracije 500 ppm. Ostatak od 20 reznica poslužio je kao kontrola. Nakon tretiranja hormonom reznice su pikirane u tzv. »paper pot saća« (sadrže 80 heksagonalnih otvora dubine 15 cm, napunjenih supstratom treset : pijesak u omjeru 3 : 1).; By selecting plus trees in a base population, a breeding process of Norway spruce as Christmas trees was initiated in Croatia. The next stage of the process is the optimization of the cloning procedure of selected plus trees for the mass production of their reproductive material (seedlings). The assumption is that qualitative reproductive material exhibiting stability of targeted phenotypic traits will be created in such a way. The main aim of the research was to determine the success of various hormonal treatments on rotting of hardwood cuttings of older Norway spruce trees (10–12 years). Two experiments were carried out. In the first, 270 cuttings were cut off in early spring from each of the three crown levels (upper, middle and lower third of a crown), on a sample of 10 trees. The cuttings from each level were treated with 24 different treatments (dipped in IBA and NAA hormone solutions of 250, 500, 2500 and 5000 ppm for 10s, 1h and 2h). In addition to these treatments, 10 cuttings from each crown level were treated with a commercial hormone product named Clonex (a gel). Additional 10 cuttings were treated with distilled water for 2h and the remaining 10 were not treated. The last two groups of cuttings served as a control of the success of the analyzed hormonal treatments. Another study was conducted on 80 cuttings cut off in late fall from the lower third of a crown of the 13 selected plus trees. Thirty cuttings were treated for 10s with: (i) 2500 ppm IBA solution, and (ii) 500 ppm IBA solution. The remaining 20 cuttings served as the control. Afterwards, the cuttings were placed in containers filled with peat, sand and perlite substrate. The rooting success, the number of roots per cutting, and the length of the longest developed root were determined later in October.