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Brief explanation on plant hormone.
Plant hormones are chemicals produced by plants that regulate the growth processes. 

Plant growth regulators are chemicals applied by a horticulturist to regulate plant growth. In plant propagation, cuttings are dipped in a rooting hormone to stimulate root development. In greenhouse production, many potted flowering plants (like poinsettias and Easter lilies) may be treated with plant growth regulators to keep them short. Seedless grapes are treated with plant growth regulators to increase the size of the fruit. In special situations, turf may be treated to slow growth and mitigate the need for mowing. Because plant growth regulators are effective in parts per million or parts per billion, they have little application in home gardening.

Plant Hormones

Auxins produced in the terminal buds suppress the growth of side buds and stimulate root growth. They also affect cell elongation (tropism), apical dominance, and fruit drop or retention.

Gibberellins affect:

The rate of cell division
Flowering
Increase in size of leaves and fruits
Seed and bud dormancy
Induction of growth at lower temperatures 

Cytokinins promote cell division, and influence cell differentiation and aging of leaves.

Abscisic acid is considered the “stress” hormone. It inhibits the effects of other hormones to reduce growth during times of plant stress.


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