The key to the technique is to remove the terminal bud at seedling stage, so that the axillary buds of the first or the second pair of true leaves become double stem.
其关键技术是：于幼苗期摘除顶尖，使每单株第一对(或第二对)真叶叶腋间腋芽萌发成长为双茎。
2
The optimal explants were stems with double axillary buds.