ROADSIDE weed control is in crisis, Landcare groups say.

Split responsibilities for weed control, confusing legislation and lack of council interest have seen weeds take over roadsides.

Farm groups say roadside weed control is a council obligation but Victoria's peak local government body says responsibility is shared with farmers.

The situation follows the 2006 bombshell that legislation drafted in 1994 - meant to make farmers responsible for roadside weeds - had shifted the responsibility to VicRoads and local councils.

Gippsland's Wonyip Landcare Group member John Kosta said the situation was "ridiculous".

"The shires have wiped their hands of it," Mr Kosta said.

"In the meantime, we're building up a weed seed bank (with) millions of seeds ... there's no commonsense plan."

Mr Kosta said pine trees and cape broom were taking over native forest.

Victorian Farmers Federation land management committee chairman Gerald Leach said roadside weeds were not farmers' responsibility.

Councils had shown a "general reluctance" to take care of weeds, he said.

"However, just as we expect farmers to abide by the law ... they have to accept that responsibility."

Municipal Association of Victoria chief executive Rob Spence said weeds were also the responsibility of farmers.

He said Victorian Government grants to councils in exchange for controlling weeds were "working reasonably".

But he admitted some weeds may be out of control and that some councils were not controlling weeds.

A Victorian Government spokesman said $24 million had been allocated to roadside weeds.

"VicRoads maintains the responsibility for the management of regionally prohibited weeds, regionally controlled weeds and established pest animals on roadsides of freeway and arterial roads."

In some cases adaptation to the weed's presence was the "only available option", he said.