The lemon tree, with the scientific name Citrus limon, is native to Asia and dates back to around 1000 to 1200 years after Christ. For people living in tropical areas. Kumquat is a small tropical fruit tree. This evergreen tree has deep green leaves and produces olive-sized fruits that resemble miniature tangerines in size and color. Kumquat is one of the fruit trees that can be easily grown in garden pots. Their usual type, which is usually Nagami, has an oval-shaped fruit.