Plant hormones have a few commercial uses...
Producing seedless fruit
Fruits will normally only grow on plants which have been
pollinated by insects. If a plant isn't pollinated, fruits and seeds won't grow. Unless
growth hormones are applied to the unpollinated flowers. This produces seedless fruit which has commercial value.
Controlling the ripening of fruit
By harvesting unripe fruit and applying
ripening hormone at the correct time, fruit can be just right for when it hits the shelves. The ripening hormone will be applied as it's on the way to the
supermarket.
Growing from cuttings with rooting compound
Normally when you stick
cuttings in the soil, they won't grow. But if you apply rooting compound, it'll take hold and grow quickly. This is an excellent way to produce clones of a good plant quickly.
Killing weeds
Hormonal weedkillers totally
disrupt the
growth patterns of weeds, killing them and leaving everything else standing.