Snow in Central Otago yesterday flattened a good portion of crops just as harvest season was beginning.
Altitude Peonies owner John Smith said he would not know the full extent of damage until the weather cleared.
"I can pretty much tell you now we've lost at least half.''
It is not the first time the weather has made things difficult.
Altitude Peonies' partner John Crawford, who grows peonies 1km from Mr Smith's field, said snow also caused major flower losses last year.
"What happened was the snow forced the flowers flat. As they came back up again, a lot of the stems got sunburned.
"We lost at least three-quarters of our crop as a result.''