The launches, which come ahead of the Wine Institute of California's annual tasting in London on March 26, coincide with a new addition from Pacific Wines, the joint venture between BRL Hardy and Constellation Brands.
The company hopes the £7.99 Blackstone range, which comes hot on the heels of Pacific Wines' introduction of Californian brand Seventh Moon, will fill a gap at the premium end of the market.
Pacific Wines' chief executive, Jose Fernandez, said: "Seventh Moon is quite mainstream but Blackstone is a niche brand aimed at the specialist and wholesale markets."
Christopher Carson, BRL Hardy's European chief executive, added that the merger with Constellation Brands would bring more Californian brands to the UK if it went ahead as expected next month.
Another newcomer to the Californian sector is the McManis label, which will enter the market after the tasting. Kingsland Wines and Spirits has been appointed to distribute the brand's five varietals in the UK.