Final answer:
Kingstown, located in St. Vincent and the Grenadines, is nicknamed the Garden city of the Caribbean due to its famous botanical gardens that highlight the region's agricultural and natural beauty.
Step-by-step explanation:
The city nicknamed the Garden city of the Caribbean is often referred to as Kingstown, located in St. Vincent and the Grenadines.
While the provided information focuses on various locations that exhibit lush gardens, like the Gardens by the Bay in Singapore, and historical aspects of Caribbean cities and plantation regions, it does not directly name Kingstown.
Nonetheless, Kingstown is known for its botanical gardens that contribute to its Garden City nickname, and it embodies the rich agricultural and natural beauty prevalent throughout the Caribbean region's history.