QuestionsPerennial weedsGarden SkillsWeedsMoss or Weed? 0 Vote Up Vote Down James Carlisle asked 8 years ago I have this growing profusely between the block paving around the house We are surrounded by trees. Is it a weed or a moss and how could I treat it ? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago That is liverwort…. related to moss, a very ancient plant, common in damp spots. Scrape it out or use a patio moss killer.