Differences between florigen and other growth hormones are
Florigen :
It is a hypothetical hormone and has not been extracted from plants.
It also is supposed to be synthesised in leaves.
Florigen is formed only when the plants attain a specific reproductive maturity.
Other Growth Hormones :
All plant growth hormones have been isolated from plant sources.
They are synthesised in apical meristems.
Growth hormones are formed in ail stages of plants including seed germination.