Mixed weather in South Australia's south east is likely to mean an average yield for lucerne seed.
Last year, growers had a bumper crop - a welcome relief following the losses from the lucerne seed wasp plague of 2012
Keith agronomist James de Barro says hot weather has reduced the potential of this year's crop.
"Lucerne thrives in consistency of weather, not too many highs, not too many lows," he said.
"Really, this year's been quite erratic in the weather.
"We've gone from cool to stinking hot through January, so suffice to say it hasn't been a really good summer to date to produce seed crops."
© ABC 2014
17:37 EDT Much of western New South Wales has begun a heat wave, reaching at least five degrees above average for at least five days, averaging a maximum of 35 degrees or more.