Plotting with conditions


I am trying to plot a function with condition that x>zeta. my input is

If[x > ζ, Plot[polarizedgpd[x, -3, Λ, 0.2], {x, ζ, 1}]] 

But my output is

If[x > 0.2,Plot[polarizedgpd[x, -3, Λ, 0.2], {x, ζ, 1}]] 

However, I am defining $ \zeta=0.2$ , but still not getting anything.