text: Mosses have no true roots and no true vascular system (at least not as derived as the higher platns). That means they can't extract nutrients from soil very well, they can't distribute nutrients efficiently, and they can't anchor themselves as firmly to the ground as higher plants. They also require water (mostly splashing rain) for reproduction. These limitation restrict moss to a low growing life-style in moist habitats where they can grow in dense groups for structural support.