Horsetails run wild!!!
How do I get rid of Horsetails...Had a new septic put in 6 years ago. They brought in outside dirt...must have been infected with them...after designing and putting in plants and different shrubs, Mounded area level area my drain field is covered in beauty bark and different plants and shrubs, have been getting horsetails more and more over the last 4 years. Pull them out, black plastic over a large area to kill them etc. Please help. Live on the Long Beach peninsula, State of Washington, USA. Please help.