English onion growers are concerned that there may not be enough volume to last the market through the season, according to trade sources.
The impact of the hot summer has meant that bulbs have not grown as much as usual, so the grade out is smaller.
The Continent has faced similar weather problems and may not be able to fill the gap.
Therefore there will be greater reliance on early summer imports from the southern hemisphere.
That in turn could push up wholesale and even retail prices for the kitchen staple.