plant hormones such as auxins and cytokinins. Plant hormores are
chemicals that regulate the growth of the plant. There are several
categories of them, but until now many aspects of these hormones have
not been understood.
This type of growth is referred to as apical growth and is stimulated by the growth hormone auxin. Apical refers to the top or apex of the tree and the ends of branches. Another group of growth regulators, cytokinins, do the opposite.
You remove the food and auxin along this pathway to the roots. The response by the roots will be to wall off those pathways. Simultaneously, you are removing the strong auxin signal that has been keeping the buds behind the terminal bud suppressed.
The cells are sensitive to a plant hormone called auxin that is produced by the leaf and other parts of the plant.
Allows maximum growth on a branch, which increases its size or health due to an increased flow of auxin growth hormones to the growing tips.
 See also: Plant, Tree, Bonsai, Grow, Growing
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