Jersey's cauliflower and calabrese crops will have to be cut early because of unusually warm weather.
Many vegetables will be left to rot in the ground
Growers say island supplies will not be affected, although some vegetables will be left to waste in the ground.
Amal-gro, which is based in St John and grows and supplies vegetables to local supermarkets, said the mild weather has disrupted the harvest.
Some crops also have pests, such as caterpillars, which would normally have been killed off by a cold snap.
Mike Greenwood, Amal-gro's director, said vegetable prices will not go up and there will not be a glut in the shops, but about 15% of his crop will be left uncut in the fields.