Plant hormones increase the rate of growth by promoting cell elongation and cell division. This effect has been exploited in the horticultural industry.
Rooting hormones
Stem cuttings will naturally produce roots, given time. Adding rooting hormone speeds up the production of roots, which means the plant can be quickly established.
What is the commercial advantage to using rooting hormone?
If the plants can grow quicker you can make more money because you've got more plants to sell.
Weedkillers
An ideal weed killer will kill the weeds but not the other plants. Hormone weed killer work by stimulating growth of the weed at a rate so fast that it cannot sustain it and dies.
Why is it commercially important to kill weeds?
Weeds compete with crop plants for water , nutrients, sunlight and space.
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