Duckhorn Wine Co. has purchased Napa Valley’s Three Palms Vineyard, which helped pioneer merlot in California.

St. Helena-based Duckhorn has been sourcing its fruit from Three Palms for 37 years, and since 2011 has been purchasing all the grapes from the 83-acre vineyard that had been operated by Sloan and John Upton. The brothers have owned the property since 1967.

The purchase price was not disclosed for the site on the Silverado Trail North that has 73 acres of active vineyards, 50 of which are planted exclusively to merlot.

The sale now gives Duckhorn 223 planted acres, both in Napa’s mountains and valley floor. Duckhorn Wine Co. President and CEO Alex Ryan said in a statement that “Three Palms is the crown jewel of our estate program.”

EDITOR'S NOTE: Sloan and John Upton are brothers. An earlier version of this story misidentified the two men.