楸树播种育苗虽然在生产上早有应用,但一般方法培育的一年生播种苗,平均苗高仅50～100厘米,2年生苗亦只有2米左右。因此,当年苗比较弱小,尚需培育两年才能出圃。这种老的播种育苗方法,不但周期长、成本高、质量差,而且需种量大(每亩播种量1～2公斤)。楸树多同无性系集中分布,繁花不实,种子产量低,这样就使楸树 Catalpa bungei sowing Although the production has long been applied, but the general method of cultivation of annual sowing seedlings, the average height of only 50 to 100 cm, 2-year-old seedlings are only about 2 meters. Therefore, when the seedling is relatively weak, it still needs to be nurtured for two years to get rid of it. This old method of sowing seedlings not only has long cycle, high cost and poor quality, but also requires large amount of sowing (1-2 kg per acre). Catalpa trees with more clonal distribution, unreal flowers, low seed yield, so that Catalpa tree