Plants in the genus Citrus (and others closely related) provide a wide assortment of fruit types, including sweet orange, grapefruit, mandarin, lemon, lime, pummelo, kumquat, and finger lime.
Most citrus trees are grown as a grafted combination of a scion (fruiting cultivar) on the top, and a rootstock cultivar that forms the lower trunk and root system.
This site is dedicated to providing information to citrus growers, nurseries, and researchers about the citrus rootstocks that are a critical component for a healthy citrus tree.