Plant Growth Regulators are any substance or mixture of substanc s intended,kthrough physiological action, for accelerating or retarding the rate of growth or maturation or for otherwise altering üie behaviorofornamental or crop plants or the produce thereof, but not including substances intended as plant nutrients, trace elements, nutritional chemicals, plant inoculate, or soil amendments. Plant growth regulators also knowmas growth regulators or plant hormones, these are chemicals used to alter the growth ofa plant or plant part. Hormones are substances naturally produced by plants, substances that control normal plant functions, such as root growth, fruit set and drop, growth and other development processes.

It helps to increase of fruit size. Plant growth regulato alter hormone responses to control plant functions, including the plant's growth and development. Theregu ators workon plant hormones, many of which serve multiple functions. For this reason, a single plant regulator used, by agriculturalists or horticulturalists' can either provide several benefits or have a single benefit with unintended drawbacks.