Calamondin, Citrus mitis, an acid citrus fruit originating in China, was introduced to the U.S. as an "acid orange" about 1900. This plant is grown more for its looks than for its fruit edibility and performs well as a patio plant or when trimmed as a hedge. It is hardy to 20 degrees F. and is hardier to cold than any other true citrus species - only the trifoliate orange and the kumquat are more tolerant to low temperatures. Calamondin is also moderately drought-tolerant.
The edible fruit is small and orange, about one inch in diameter, and resembles a small tangerine. The peel is thin and smooth, yellow to yellow-orange and easily separable.
Trees may live for forty or more years.