Indoor bonsai have become extremely popular in recent years. They make excellent gifts because they are different and say something about you. They are very similar to houseplants as they can tolerate indoor conditions, but will need just that extra bit of care and attention if they are to do well. Most of them are tropical or semi-tropical species. They usually require lots of light and fairly constant temperature and humidity. The secret is not to forget to water them!
Do not panic if they lose some leaves in the Autumn and Winter. This is quite normal as they are shedding their old leaves to make way for the new ones which will come in the Spring.
Trees like the Pepper, Chinese Elm, Pomegranate will shed all their leaves in Autumn, but this is quite normal. But remember to continue watering them in Winter, although they will not require as much water in Winter as they do in Spring and Summer.
The easiest of all the Indoor varieties is the Ficus. It is the most trouble free of all the Indoor varieties. It can stand normal living room conditions.
All the other indoor varieties such as the Chinese Elm, Pistacia, Myrtles etc, need a very cool room and should preferably be kept outdoors in the Summer. If you have a conservatory, this is a good environment for your indoor bonsai in Winter, but in Summer - the conservatory will be too warm.
Please note that heights given in the descriptions are approximate and are to the nearest 5cm. The beauty, shape and trunk thickness are the more important factors. Remember - size isn't everything in bonsai. Its the beauty and quality of the tree that matters.