Unfortunately, we get these cries for help quite often on our forums. Taking care of a Bonsai tree can be a bit overwhelming for beginners, but with this guide you should be fine. We'll investigate the causes of your tree losing leaves and the remedies!
Why does a Bonsai drop its leaves?
There is a difference between indoor Bonsai and outdoor bonsai.
Indoor Bonsai should be kept above 60°F (15°C) throughout the year, meaning that in most climates they need to be kept indoors during winter time. Most indoor Bonsai species (Ficus, Carmona, etc) do not drop their leaves, unless there is a problem:
Outdoor Bonsai need to be kept outside, year round. Typical outdoor Bonsai species include the Juniper and the Chinese Elm. The Juniper is an evergreen, while the Elm is a deciduous tree that drops its leaves (or at least part of it) during autumn and winter. Assuming your tree is losing leaves not because of the season, but due to a problem, this is what you should be looking at: