I need to remove a great deal of fern that i have growing up the side of my driveway. Whats the best way to remove it so it wont grow back and not harm and trees that are next to it ? I don't know if i should pull it all out, or spray some poison first then pull it out a few days later? What should i do? I want all the fern gone as its taken over all the length of my driveway.