"The merger will provide shared benefits through increased size, enhanced product range, and geographical diversity," he said.
Pask has a 1000 tonne winery on Omahu Rd and 60 ha of vineyards in the Gimblett Gravels.
Pask founder and the first person to plant a vineyard on the Gimblett Gravels, Chris Pask, will be Founding Director on the Pask Winery board.
Jeff Clarke has been appointed the Group's chief winemaker. He began his winemaking career in Australia, has been involved as head winemaker at Pernod Ricard and more recently Ara Wines.
"Jeff Clarke has an outstanding reputation for consistently producing world class wine," Mr Hart said.
"His appointment will build on the shareholder vision, direction, and standing of both brands.
"The merger comes on the back of the prestigious International Wine Challenge in London where Pask's 2014 Declaration Chardonnay won Gold and the Hawke's Bay Trophy, Pask's Declaration Syrah won a Gold medal, as did Jackson Estate's 2014 Vintage Widow Pinot Noir."
Pask's four vineyards are planted mainly with red varietals. Merlot, cabernet sauvignon, malbec, syrah and cabernet franc make up about 75 per cent of the planted area, with the balance in white varieties.
Jackson's winery specialises in pinot noir, also producing sauvignon blanc, riesling and chardonnay.
For the year to June New Zealand wine exports grew 6 per cent to a record $1.66billion.