Kumquat trees are small, fruit bearing trees. These members of the Rue family are only hardy in United States Department of Agriculture (USDA) zones 8 to 11, but may be container grown as far north as zone 4.
Kumquat trees will reach a height of 8 to 15 feet when mature. They are slow growing and tend to be shrubby.
The fruit of these small trees is thick and edible in addition to the sweet interior fruit. Because these trees are small, 15 feet or less, the fruit is easily harvested.
Because Kumquat trees are small enough (some only getting 8 feet tall), they can be container grown using a potting soil that is sand based. The trees may either be left inside by a sunny window or placed on a porch or patio as long as they have good sun.
These small trees are mainly grown in California, Texas and Florida where they can live outdoors in groves. They are a good choice as they are more hardy than most fruit tress with some tolerating temperatures as low as 10 degrees F.
Until 1915 these little trees were classified as citrus. It was at this time that Dr. Walter T. Swingle reclassified them into the genus Fortunella.
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