QuestionsHow to growLawnsWeedsthistle problem 0 Vote Up Vote Down Jenna Moynagh asked 14 years ago Small problem of thistles all over the garden to the point you cannot walk on it. how do i most cost effectively get rid of them?first time gardener with a lawn only seeded two years ago,nothing else on the lawn. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Thistles can be killed by using Lawn weedkiller in the next six weeks, and mow regularly.