定芽是生长在植物体上一定位置的芽。定芽又分为顶芽和腋芽。顶芽是生长在主干或侧枝顶端的芽;腋芽是生长在枝的侧面叶腋内的芽。不定芽是生在根、茎、叶上不定位置的芽。如榆、相思树等根上长的芽(榕树根上不长不定芽)。一般植物老茎重修剪后,创伤口上会产生大量的不定芽。制作树桩盆景,利用顶芽使主干或侧枝伸长,利用腋芽使分枝增多。 Buds are buds that grow in certain places on the plant. Buds are divided into top buds and axillary buds. The apical bud is a bud that grows on the tip of the trunk or lateral branch; the axillary bud is a shoot that grows in the axil of the lateral leaf of the branch. Adventitious buds are born in the root, stem, leaves indefinite position bud. Such as elm, Acacia and other roots on the long bud (banyan roots are not long adventitious buds). General plant old stem weight pruning, trauma will produce a large number of adventitious buds. Making stump bonsai, the use of the top bud to the main stem or lateral extension, the use of axillary buds to make more branches.