Why some gardens are called ‘Botanical’ Gardens?

Private and public gardens and parks are created to make our surrounding more pleasant. The purpose of ‘botanical garden is to provide the right setting for making a scientific study of different kinds of plants. Botanical gardens contain greenhouses which enable exotic plants to be grown. There are also laboratories for study and experiments, and libraries.
Botanical gardens are usually open to the public, so we are given the opportunity to see plants which we wouldn’t normally see in our own country. One of the most famous is Kew Garden in England where you can seen a wide variety of plants and trees from many countries.