You have to pass a written and practical test (aka subjective test) - administered by other licensed florists (aka your competitors).
Licenses should be about public safety. There's no reason to have a subjective test when it comes to this.
It seems though in some industries (not all), as you allude to in the floral industry, that licensing is just another manifestation of rent seeking and ever encroaching regulatory capture.
Would you concur? Curious to hear what you think there could (or should) be done about it in your opinion? In the case of selling floral products-caveat lector: I know nothing about flowers other than they are pretty and smell nice-would it make sense to replace licensing with some sort of rating system for businesses to aid consumers in deciding who they want to procure professional services from based on assessed expertise and past services rendered (not Yelp, an assessment from your industry peers)?
+ E.g. a cheap electrician using aluminum wiring that may short in 10 years and burn the house down. But of which the customer may not be aware / informed.
I see licensing as buying into the system and aligning interests. Suddenly, it's in a tradesperson's personal interest to follow regulations, as they otherwise risk their right to practice.
That said... as was mentioned upthread, there's a happy balance. If there's limited long term harm, it's probably not justifiable to require licensure.