Two officials from the Gangmasters Licensing Authority (GLA) are to be based in Lincolnshire in a crackdown on firms that exploit land workers.
The GLA announced its first local community enforcement postings to cover "hotspots" Spalding and Boston.
It comes as flower factories and nurseries gear up for an increase in labour for Valentine's Day.
The GLA said it was cracking down on employers who illegally employ cheap labour and undercut other firms.
Ian Livesey, chief executive of the GLA, said: "We know there are some hotspots in the country and Lincolnshire with its fresh produce is one of those.
"The officers' role will be to get under the skin of the issue and work with the local authorities and police so we can really understand what's going on in the local areas where we know gangmasters are operating quite effectively and extensively."