The wet spring weather which boosted grass growth on pastoral farms has taken a toll on vineyards in the country's largest wine-producing region.
The cold and wet conditions have affected the flowering of vines in Marlborough, which produces three-quarters of the country's wine.
New Zealand Winegrowers chairman and Marlborough grape grower Stuart Smith says pinot noir and chardonnay varieties are struggling through flowering at the moment.
He says luckily the main crop, sauvignon blanc, won't flower for another week, when the weather is forecast to improve.
Mr Smith says it's too early to tell if the poor flowering will mean less wine next year.