Hundreds of different citrus rootstock cultivars are available. Many rootstocks were chance finds from natural populations, and not the product of intentional breeding efforts. Other rootstocks in common use have originated from planned citrus hybridization and breeding efforts, and the oldest of these programs is that of the U.S. Department of Agriculture, currently located at the U.S. Horticultural Research Laboratory in Ft. Pierce, Florida. This site aims to present accurate information on many citrus rootstocks that are available, but emphasis is on the rootstocks developed and released by USDA.
Following is a list of rootstock cultivars released by USDA. Click on the rootstock name to see additional information.