The Ficus genus belongs to the family of mulberry plants or Moraceae, and it’s the most popular indoor tree species for Bonsai beginners.  Ficus Retusa are often shaped with an s-curved trunk and has dark green oval leaves.It can be kept outside in the summer as long as temperatures are above 60°F (15°C). It requires a lot of light, preferably full sunlight, so be sure not to place it in a shady location. The temperature should be kept relatively constant.