Sphagnum moss is a delicate system of capillary tubes allows the moss to absorb water like a sponge. They sometimes grows in small patches, but are generally found growing in a thick, dense clump. Sphagnum moss grows so close that it forms a cushiony “bog mat” that floats on top of the water; the mat is so strong that it can support the weight of several large moose. It’s roots are also very shallow. It is found in wet and boggy areas, and likes acidic (low pH) soil, so it is generally not found growing in the woods or in water that contains lime.