QuestionsHow to growLawnsWeedsDocks in lawn 0 Vote Up Vote Down Eddie Deevy asked 16 years ago Hi Gerry, I seeded a new lawn last summer and have a problem with docks in the lawn since. I’ve kept the lawn well mown this summer but still they thrive. Is spot spraying with roundup the best solution here ? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago Do not spray a lawn with Roundup, use Lawn weedkiller during fine warm weather.