|Kumquot Illustration 1906|
Via Monrovia, Kumquots are native to China. Small tree, fruit with thin sweet rind and sour juicy flesh.
Via Wikipedia, Kumquats are Citrus japopica "margarita": or Fortunella japonica. They are more cold tolerant than most citrus, survive down to 18F.
The flowers are small and fragrant, similar to other citrus. The trees bloom in late Spring and the fruit matures in early fall.
|Kumquat at Corfu|
For growth in containers, Kumquats need to be on dwarfing rootstock (trifoliate orange, Poncirus trifoliata, flying dragon), not rootbound, and have regular watering and feeding. I did let mine dry out rather badly last winter, and it survived.
Via gardening.ktsa.com, Kumquats are later blooming than other citrus. The fruit is aromatic and spicy. The fruit matures in November.
From greenzonelife.com, kumquats grow poorly on their own roots. Kumquat dormancy is profound, and they break dormancy later than other citrus.
All photos here are cropped from photos on commons.wikimedia.org.