Dennis Staunton says this year is the worst spread of the invasive, yellow-flowering weed he has seen in 30 years.

Mr Staunton and his son regularly pull the poisonous plant from the ground and he also offers help to his neighbours.

He has filled 27 stock-feed bags from his paddocks this year, but has also noticed it along the side of roads in Milton.

"The last couple of years was bad. This year is the worst."

The plant competes with pasture and is toxic to livestock. It has a yellow flower, usually with 13 petals.

"It attacks the liver in animals and kills them eventually," Mr Staunton said.

Some farmers from Nowra to Bega have found cotton aphids have destroyed fireweed. Other landowners use sheep, but sheep that "eat fireweed over two years or more years may become unwell or suddenly die", according to NSW Department of Primary Industries.

Mr Staunton says the best method is pull the weeds from the ground. However, people must bag the plants if the weed is in its white, seeding stage.

"The only way to get rid of this is to get off your backside and pull it out. If you pull out one you save 100 from growing. It's manageable if you don't go bananas and try to pick it all over a weekend."

Mr Staunton said he also understood how daunting the job can be for large landowners. He wished a business such as a supermarket or bank would sponsor or support community groups in removing fireweed from their districts.

Mayor Amanda Findley said council has supported residents with identification and eradication techniques in the past. Council does offer staff in a fee-for-service to spray paddocks.

Cr Findley also called on people to remove the weed if they see it while they're walking.

"It's a bit like Take 3 for the Sea," she said.

The pair reminded residents to wear gloves when pulling large amounts of the weed from the ground. Contact council on 4429 3111 for more information about fireweed management.