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 Did you know that the plant Trifoliate orange - Poncirus trifoliata is widely used as citrus rootstock (oranges, lemons etc), because it is valued for its resistance to cold?
Trifoliate orange - Poncirus trifoliata
The trifoliate orange, Poncirus trifoliata (syn. Citrus trifoliata), is a member of the family Rutaceae. Whether the trifoliate oranges should be considered to belong to their own genus, Poncirus, or be included in the genus Citrus is debated. The species is unusual among citrus for having deciduous, compound leaves and pubescent (downy) fruit.
It is native to northern China and Korea, and is also known as the Japanese bitter-orange (karatachi), hardy orange or Chinese bitter orange.
The plant is a fairly cold-hardy citrus (USDA zone 6) and will tolerate moderate frost and snow, making a large shrub or small tree
2–5 m tall. Because of its relative hardiness, citrus grafted onto Poncirus trifoliata are usually hardier than when grown on their own roots.
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