Bronco Wine Co. has seen its final push to reverse a 'Napa' ruling founder.

The US Supreme Court yesterday (23 January) declined to hear the wine company's challenge of the law, stating that wine labelled with the word 'Napa' must be made mostly from grapes from the region.

In refusing to hear the challenge, the justices did not make any further comment.

Bronco had hoped to argue that the Californian law, passed in 2000, prohibiting companies from using the name Napa in a brand name unless the wine inside is actually Napa wine, violated constitutional free-speech rights under the First Amendment.

The company, whose Napa Ridge, Napa Creek Winery and Rutherford Vintners brands were central to the case, claimed that its labels were not deceptive as the origin of the grapes was also printed on the labels.

In August last year, the California Supreme Court denied Bronco's appeal against the original decision by the California Court of Appeal.

Bronco said that it was "disappointed with the Supreme Court's denial of our request to review the state court's erroneous ruling on our claim".

The company added that it "intends to maintain all its brands and will do so in full compliance with the law".