During succession, what might become the limiting factor for sun loving mosses as taller plants begin to grow?

During succession, the limiting factor that may affect the sun-loving mosses when taller plants start to grow around them is that there will be a competition in the water available in the soil since there is a high chance that these taller plants could use the water up more. In addition, these mosses will not get the full benefit from the sun because the taller plants are blocking.