Ok for the sake of completeness:
Given sufficient elevator control authority one could cause a stall in a fixed wing aircraft at any attainable speed. I.e from just over zero knots to beyond Vne. However don't try this unless you are in an aerobatic category aircraft for which you are fully rated and at sufficient height and wearing a parachute. Do not try this above the maneuvering airspeed limitation otherwise you may exceed the design limitations of the aircraft or yourself.
I would happily demonstrate a stall at up to maneuvering airspeed but not beyond as that could overstress the aircraft and might only be performed once.
Last edited by outofwhack; 12th Nov 2012 at 00:30.