There are many different bonsai types to choose from. It can generally be classified as Indoor and Outdoor. Certain species like Ficus are one of the most popular indoor varieties.Although the same tree can be grown indoors as well as outdoors, but ceratain species are more easier to grow in the indoor environment.
Bonsai plants are miniaturization of trees which if left untrained would grow to their normal form. It is the training under constrained area that makes them to stay small, the basic requirements is same as those of trees growing in the outdoors and it takes special care to make them grow indoors. When grown indoors, these trees must be kept at a place which gets ample amount of light and is moist. Do not keep it near ovens or hot places like the kitchen. Additionally you can place it near by a bucket of water to recreate a humid environment.
Bonsai can also be classified based on their size.And the most commonly found sizes are Thimble , Mame , small, medium and large with the large ones growing more than 36 inches tall. Certain types like the imperial are actually around 10 feet tall.
Although they can be classified into different types, but the basic techniques of training is common. All the types need to be pruned, wired, watered and trained to make them grow in proper shape and size. For smaller bonsai like mame, carrying out pruning exercises would become difficult and you would need to pay extra attention.
You can also classify them into different types based on the species they belong to. Although most of the trees from nature can be made to grow as bonsai, some of the varieties are more suitable than ohters. The most common species used are Jade, Ficus, Bougainvillea, Tamarind, Juniper, Pines, Cedar, Elms, Boxwood, Azalea, Maples, Grapes, Fukien tea, Schefflera, Cherry, Serissa, Sago Palm, gardenias and many more.