Citrus japonica- Kumquat Fruit Tree

Kumquat (Fortunella japonica syn. Citrus japonica), sometimes spelt cumquat or comquot, is a small citrus fruit that grows in climates too cool for other citrus plants. 

They are some of the easiest fruit trees to grow in garden pots.

When ripe, kumquat fruit has a sweet, edible skin with slightly sour meat inside. Kumquat trees are considered to be heavy fruiters, with some varieties flowering and producing fruit twice per year.