Germplasm sources of almond
The almond is a uniquely California crop and 99 percent of U.S. product occurs here. Germplasm materials in California originated as chance seedlings from seeds and plants imported from the Mediterranean region between 1850 and 1900. The basic cultivars Nonpareil, Texas Prolific (now known as Mission), Ne Plus Ultra, Peerless, Drake, and I.X.L. originated with this material.