But the differentiation could be
For Non-gardens exhibition is a marketing tool primarily or a display of show & Pomp(Conservatories and heritage gardens set aside)
Exhibition aims at
Customer contact
Product and service launch platforms
Marketing communications
Sale
Display of one's ability(show & Pomp)
Attraction for something else (Like i open up a restaurant and arrange for exotic birds display/Boutique display etc so that more people visit my restaurant.
Neither of which is an aim If Mr.Rafique exhibits his garden to me????

His aim should be
Sharing common love & interest of the hobby/nature
Sharing of knowledge & ideas
Motivation for me.
Sharing of Joy.
Sharing of possibilities what can be grown
and most importantly ...........Reward/realization or acknowledgement of his hard work/effort.
I might need to buy a ticket to visit an exhibition but i would never need anything to visit his garden
