A large amount of vegetaion on a cliff can increase its resistance to erosion, most greatly for unconsolidated material (boulder clay), this is because the roots of the vegetation binds the material together, adding more consistency to it.
However, it could also increase the susceptibility to erosion by creating fracture in the rock (mostly in harder rock) leaving it vulnerable to freeze-thaw weathering, recrystallisation of salt and Hydraulic Action.
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